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Eye acupuncture for pain conditions: a scoping review of clinical studies

BMC Complementary Medicine and Therapies volume 21, Article number: 101 (2021) Cite this article

Abstract

Background

Chinese eye acupuncture, focuses on treating different diseases by applying needle stimulation around the orbit of the eye. Since 1970, it has been used in China for the management of pain-related disorders. This scoping review systematically collected clinical studies on the use of eye acupuncture to treat pain conditions and identify any adverse events.

Methods

Six databases including PubMed, the Cochrane Library, CNKI, VIP, Wan Fang Data and SinoMed were searched from 1970 to March 2019. Randomized controlled trials (RCTs), clinical controlled trials (CCTs) and case series on eye-acupuncture for pain conditions meeting the inclusion criteria were identified. Data were extracted on patients, interventions, details of eye acupuncture, control treatments and outcomes.

Results

Searches identified 81 clinical studies and a trend demonstrating an increasing number of published studies. All studies were conducted in China and published in Chinese. These included, 45 (55.6%) RCTs, 5 (6.2%) CCTs, and 31 (38.3%) case series, treating 7113 patients with 44 different pain-related diseases or symptoms. The most frequently reported conditions were headache (18, 16.2%), acute lumbar pain (7, 6.3%) and lumbar disc herniation (7, 6.3%). Treatment using small needles (φ0.25 × 13 mm), retained ≤30 min, needling the horizontal outer orbital edge and the avoidance of manipulation during treatment were the most frequent descriptions of the interventions used. Eye acupuncture was used alone in about half of the studies and of the remaining studies it was combined with other treatment. All studies suggested some beneficial effects including: pain relief, improved quality of life and mental health, and 18 (22.2%) adverse events.

Conclusion

Eye acupuncture, predominantly studied in China, may be a promising intervention for managing diverse pain conditions. However, given the variety of study designs and reported treatment outcomes, conclusions about the evidence for eye acupuncture for specific conditions are not possible at this stage.

Peer Review reports

Background

For pain management, both the 2016 Centers for Disease Control and Prevention (CDC) guideline [1] and the 2017 Canadian Guideline for Opioid for Chronic Non-Cancer Pain [2] recommended non-opioid pharmacotherapy and non-pharmacologic therapy. The role of opioids in the treatment of chronic pain has increasingly come into question due to the risk of addiction, brain damage and overdose-induced death [3,4,5,6] and has insufficient evidence on its benefits [2, 7]. Non-pharmacotherapy options to treat chronic pain include: patient education, cognitive-behavior therapy and complementary and alternative therapies [8]. Body acupuncture, as part of Traditional Chinese Medicine (TCM), has become increasingly used for pain relief worldwide [9, 10], given its beneficial effects for treating pain and disability [11] and provides a potential opportunity for integration into patient-centered care [12].

Eye acupuncture is an understudied intervention and involves fine-needle acupuncture, and may also include embedding catgut at acupoints and acupressure applied around the orbit of the eye [13]. Based on the TCM theory of the relationship of the eyes to the brain, viscera, and meridians [14, 15], this therapy originated in Liaoning province, China and was developed by an acupuncturist Jing-Shan Peng in 1970 [16]. Clinical practice, clinical experimental and observational studies [17, 18] and animal experiments [19,20,21,22] have demonstrated possible mechanisms in regulating the nervous system, blood measures and molecular-level expression.

Eye acupuncture is much less complicated compared to traditional body-acupuncture as it only employs 13 acupoints, namely lung, large intestine, kidney, bladder, upper jiao, liver, gallbladder, middle jiao, heart, small intestine, spleen, stomach, and lower jiao [16]. Except for the three acupoints that represent the regions of the body (upper jiao, regions above the horizontal line on the diaphragm, included upper limbs; lower jiao, regions below the horizontal line on umbilicus; and middle jiao, the remainder), the remaining ten acupoints are all named according to the related viscera. These 13 acupoints are located at 2 mm from the outer side of the orbit in the eight areas divided equally by four pupil-centered lines. An additional figure presents the location of the 13 acupoints (see Additional File 1). A previous anatomical study has demonstrated that eye acupuncture needles are inserted through the skin, superficial fascia, deep fascia to reach orbicularis oculi muscle (avoid touching the periosteum). The superficial fascia underneath each acupoint area is in somatosensory nerves and the vascular network is enclosed by visceral sensory nerve endings [23].

A scoping review is a relatively new evidence synthesis method for identifying knowledge gaps, examining the body of associated literature, clarifying concepts or investigating the conduct of research [24]. Data can be used to inform future clinical trials in order to prioritize conditions or treatment regimens. Scoping reviews can also be precursors to conducting systematic review and therefore may be an appropriate approach to explore existing evidence for eye acupuncture and its use in reducing pain.

The aim of this scoping review was to identify clinical studies and reports on eye acupuncture with the aim of informing practitioners, patients and researchers about the use of this emerging intervention for pain relief.

Methods

Eligibility criteria

This scoping review used the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) and the PRISMA Extension for Scoping Reviews (PRISMA-ScR) guidelines [25, 26].

Types of studies

Relevant clinical studies included randomized controlled trials (RCTs), controlled clinical trials (CCTs) and case series, regardless of language, publication form or publication status were identified. Case reports which could supply any additional valuable information were also collected and are reported in the appendix but were not included in the overall analysis.

Types of patients

Patients with any pain-related diseases/symptoms were eligible. Both primary and associated symptoms were included. Studies were omitted if they failed to mention patients’ pain symptoms even though the disease might involve pain.

Types of interventions

Experimental interventions involving needle insertion, laser stimulation or transcutaneous electrical stimulation at the 13 acupoints, described as eye acupuncture, were eligible. Studies applying eye acupuncture therapy alone or in combination with other treatment were all considered eligible. For RCTs and CCTs, all types of control interventions were eligible.

Types of outcome measures

Studies were included if they reported outcomes of any pain-related symptom as either a primary or a secondary symptom.

Literature search

Two English and four Chinese electronic databases were searched from 1970 or from their inception through to 9 March 2019. An additional file provides the complete search strategy and results for the English database PubMed and the Chinese database CNKI (see Additional File 2).

Databases were:

The reference lists of included studies were scrutinized to identify possible additional relevant studies.

One author (YC) first screened titles and abstracts using NoteExpress 3.2.0.7103. Potentially eligible articles were then read in full by YC to determine whether they met the eligibility criteria.

Data extraction and analysis

One author (YC) extracted the data into a pre-designed electronic form using Microsoft Excel 2016 and crosschecked the data for duplications.

We designed our data extraction form followed the PRISMA and the PICO framework [27]. The extracted information included bibliometric data (published year, reference type, origin, funding, published language, journal, study type), patients (sample size, gender, age, disease/symptom), interventions (acupoints, comparisons, characteristics of needles and operations) and outcomes (symptom reduction, pain scales, adverse events, follow up).

These data were then analyzed descriptively by calculating frequencies, and percentages. Graphical representations of the data were created in Microsoft Excel 2016 and Microsoft Power BI. The flowchart was created using Microsoft Visio 2016. All the figures were imported in and processed via Adobe Photoshop (CC 2017).

Results

Literature search

A total of 940 records were retrieved from the literature search. Any duplicates were excluded, and the remaining studies were assessed for eligibility. The flowchart shows the selection process (Fig. 1). The review was conducted on 81 full-text articles [28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108]. Additionally, 30 related case reports were identified, but this information is presented in an additional file (see Additional File 3).

Fig. 1
figure 1

Flowchart of the literature search

Full size image

Bibliometric information

The 81 studies included 45 (55.6%) RCTs, 5 (6.2%) CCTs, and 31 (38.3%) case series. There was an increasing overall trend in the number of publications year by year. An additional figure illustrates the year of publications in terms of study type (see Additional File 4), and the percentage which were RCTs. The earliest RCT [71] was published in 1995. Since 2008, RCTs have taken over as the dominant study type from case series.

The 81 analyzed studies, all conducted in China, originated from 20 different provinces. The 81 studies consisted of, 64 journal articles (79.0%), 14 master’s theses (17.3%) and three conference papers (3.7%). The 64 journal articles appeared in 33 different journals, with the journal of Chinese Acupuncture & Moxibustion (9, 14.1%) and the Journal of Clinical Acupuncture and Moxibustion (8, 12.5%) being the most prevalent.

Patients

In total, 7113 patients participated in the 81 studies. For trials (RCTs n = 45 and CCTs n = 5), study sample sizes ranged from 24 to 248 (median: 60; average: 84.1). Among the 81 studies, a total of 74 (91.4%) studies reported gender (male: 2976, 47.6%; female: 3272, 52.4%) and 66 (81.5%) studies reported age, with a range between 9 to 85 years. The duration of disease was reported in 60 (74.1%) studies with a range of 1 h to 34 years. The treatment duration was reported in 59 (72.8%) studies and ranged from 1 day to 4 months, of which, 4 (6.8%) studies reported patients cured with a one-off treatment, and 56 (94.9%) studies applied treatment within a 2 months period.

The 81 studies covered 44 different diseases/symptoms. There were 108 conditions in total as there were studies that contained more than one condition. The conditions were classified according to the International Association for the Study of Pain (IASP) Classification of Chronic Pain to the IASP’s Axis 1 (regions) coding scheme for chronic pain diagnoses [109] which clearly demonstrates the results obtained [Fig. 2]. Headache (18, 16.2%) was the most frequently reported, followed by acute lumbar sprain (7, 6.3%), lumbar disc herniation (7, 6.3%), shoulder-hand syndrome after stroke (5, 4.5%), periarthritis of shoulder (5, 4.5%), sciatica (5, 4.5%) and dysmenorrhea (5, 4.3%).

Fig. 2
figure 2

Conditions and used acupoints. m = frequency the acupoints used; % = m/total frequency of all the acupoints used in that condition

Full size image

Interventions

Selection of acupoints

All studies reported their selection of acupoints. Their use was shown pictorially. The three most frequently used acupoints in each region of the orbit are given in Fig. 2. Details of acupoints used for each condition are shown in an additional figure (see Additional File 5).

Treatments and comparators

In terms of treatments used in the 81 studies, 44 (54.3%) used eye acupuncture alone and the others used eye acupuncture combined with other treatments. In the 50 trials (RCTs and CCTs), 55 eye acupuncture related comparisons were reported. Details of the treatment for each comparison are shown in an additional table (see Additional File 6). The treatments were first summarized in seven categories. In a second step for each category, subgroups were displayed by the intervention in the control group. Twenty-two comparisons (40.0%) applied eye-acupuncture alone as an intervention in the treatment group; correspondingly, non-pharmaceutical traditional Chinese therapy (17, 30.9%) and conventional medicine (14, 25.5%) were the most commonly used control treatments.

Characteristics of the needles

Of the 81 studies, 68 (84.0%) referred to the characteristics of acupuncture needle used, including brand/material (39, 48.1%), length (64, 79.1%) and diameter (55, 67.9%). The details of needle size are shown in (Fig. 3). It is important to mention that since the measuring unit of acupuncture needle varies, such as cun or fen for length and hao for diameter, a conversion has been done to generalize the parameters in millimeter (mm). The most frequently used needles were stainless steel acupuncture needles in φ0.25 mm × 13 mm.

Fig. 3
figure 3

Size of acupuncture needle

Full size image

Needling techniques

The basic techniques of eye-acupuncture needling varied between studies. A total of 78 studies mentioned the needle retention time, ranging from “not retaining the needle” to 8 h, with 30 min (21 studies, 26.9%) being the most frequently used duration. Of the 69 studies (85.2%) that described the approach to needle insertion, 54 studies (78.3%) used ‘horizontal needling outer orbital edge’, 27 studies (39.1%) used ‘straight needling inner orbital edge’, and 17 studies (24.6%) used both simultaneously. Of the 66 studies (81.5%) that mentioned whether the needle was manipulated or not, 47 studies (71.2%) made it explicit not to exert any manipulation of the needle during the treatment. Two studies did not specify the kind of manipulation. For the remaining 45 studies, the details of each needling technique are shown in Fig. 4.

Fig. 4
figure 4

Needling techniques. Abbreviations: RCTs: randomized controlled trials, CCTs: controlled clinical trials

Full size image

Assisted body exercise

In 32 conditions (29.6%), patients were asked to exercise (from slight movement ranges and increase the motion gradually) their affected body parts during eye-acupuncture treatment. This applied to more than half of the conditions and related to the three musculoskeletal regions: ‘lower back, lumbar spine, sacrum, and coccyx’ (17, 63.0%), ‘upper shoulder and upper limbs’ (6, 54.6%) and ‘cervical region’ (3, 60%).

Treatment effects and side effects

Of the 18 studies (22.2%) [33, 35, 37, 41, 42, 49, 62, 65, 79, 81, 83, 86,87,88, 91, 99, 102, 107] reporting outcomes on adverse events, seven studies [37, 49, 65, 79, 83, 88, 91] found no adverse events, and four studies [35, 62, 81, 87] reported patients having slight bleeding when the needle was withdrawn. The remaining seven studies reported adverse events from eye acupuncture as well as events from other interventions during the treatment, which are shown in Table 1. The effects following an adverse event in those receiving acupuncture were reported to have disappeared after rest. Follow-ups were reported in 15 (18.5%) studies, with follow up periods ranging from 2 days to 12 months in eight of the case series and 3 months to 6 months in seven RCTs.

Table 1 Details of adverse events of eye acupuncture for pain conditions
Full size table

In total, 77 studies reported an overall response rate (ORR) (87–100%, median = 96.7%). ORR stands for the sum of cure rate, significant effective rate, and improvement rate, however, since the definitions of ORR varied from diseases and studies, further analysis on ORR was not feasible. All studies reported a positive result for the eye acupuncture intervention, while two three-arm RCTs [45, 107] showed that a combination of eye acupuncture and body acupuncture had a higher ORR compared to eye acupuncture alone. The authors explained that eye acupuncture was more effective in treating diffuse pain, while body acupuncture was more effective for treating a local pain. For treating complex pain, when two acupuncture techniques were used, outcomes were further improved. For 57 conditions (52.8%), patients acquired an immediate analgesic effect after acupuncture, however, 38 (66.7%) of these conditions were from case series studies. In the 32 pain conditions which encouraged adjunctive exercise, 26 (81.3%) reported immediate analgesic effects. All the 81 studies presented data showing an improvement in pain relief, including the degree of pain relief, time spent without pain, relief of tenderness, reduction in persistent periods of pain, numbers of attacks, improvements in the range of motion of joints and TCM syndrome score. Apart from pain symptoms, treatment effects were also estimated by recurrences (9, 8.1%), changes in quality of life (including: activities of daily living (13, 11.7%), ability to work or study (20, 18.0%) and social life (2, 1.8%)), and mental health (2, 1.8%). No studies reported on economic outcomes. Twelve international instruments were used in 23 studies and the Visual Analogue Scale (VAS) was the most often used. Fifty-eight papers did not use a standardized scale.

Funding sources

Seven studies [28, 49, 92, 94, 100, 105] reported funding sources and were all RCTs published in the years 2015 to 2018. All funding came from the government, including one national project, three provincial, and three municipal sources.

Discussion

Main findings

A total of 81 clinical studies using eye acupuncture were identified and an increasing publication trend from 1977 to 2019, culminating in 45 (55.6%) RCTs, 5 (6.2%) CCTs, and 31 (38.3%) case series, with the RCT being the main study type after 2008. The analyzed studies had a total of 7113 patients with 44 with different pain-related diseases/symptoms, representing both genders and covering all ages. The most commonly included conditions were headache, acute lumbar pain, lumbar disc herniation, shoulder-hand syndrome after stroke, periarthritis of shoulder, sciatica and dysmenorrhea. The most common needling techniques were, using small stainless-steel acupuncture needles (φ0.25 mm × 13 mm), retained for no more than 30 min, needling horizontal outer orbital edge and avoiding manipulating during the treatment. Additional body exercises were applied in some studies for treating musculoskeletal pain, most of which showed immediate analgesic effects.

Eye acupuncture was used alone in 44 (54.3%) studies and in 22 (40%) studies as a trial comparator, and the others used eye acupuncture combined with other treatment. Only 18 (22.22%) studies reported on the outcome of adverse events. Outcomes were measured by multi-dimensional scales of pain symptoms, recurrence, quality of life, and mental health, with the VAS being the most frequently used instrument.

Limitations of this analysis

Our study has three main limitations. First, since the taxonomy of disease is developing and not fixed [110], it caused inevitable overlapping among the classification of pain. Second, all the included studies were published in China, and nearly one third (28.9%) of the RCTs were conducted as a master’s thesis, and funding was not mentioned. The quality of such studies may, therefore, be questionable, because procedures such as randomization, recruitment or measurement may not have been appropriately applied. Third, this report is unable to present information on the long-term outcomes and patients’ quality of life due to lack of data on follow-up in the included studies.

Implications for research

The number of RCTs identified, indicate that this field already has a history and is continuing to develop. Case series will provide some evidence on effectiveness in a real-world setting but this cannot be used as evidence of effectiveness [111].

Despite the wide-ranging duration of diseases, nearly all studies reported a treatment intensity with a duration shorter than 3 months and 29 studies used one-off eye acupuncture treatment. Although the included studies have suggested that those patients with a shorter duration of the disease were more likely to receive less intense, short periods of treatment [68, 80, 95, 108] we found no evidence to confirm this assumption. The treatment intensity also depends on the type of acupuncture treatment and the patient’s ability to quickly recovery [112]. If eye acupuncture therapy was acceptable and able to contribute to shorter treatment time in general, it could reduce patients’ health care costs as well as social burden [113]. Unfortunately, no economic data were found in this analysis.

Implications for practice

The choice of eye-acupuncture needle and needling techniques are more important to consider in terms of safety rather than regarding the effectiveness of the intervention There is a rich blood capillary network around the orbit and withdrawing the needle there may be the possibility of slight bleeding [114]. So small needles inserted horizontally outside the orbital without any manipulation could lower such risks, as well as the needling time of no more than 30 min, which is widely accepted around the world in body acupuncture.

It is known that exercise interventions could alter musculoskeletal pain memories [115], including anxiety and fear-avoidance [116]. Combining eye-acupuncture and appropriate exercise can enhance outcomes: on the one hand, eye-acupuncture can relieve pain directly; on the other hand, eye-acupuncture may enhance the efficiency of doing exercises. Since eye-acupuncture acupoints all located around the orbit, patients are able to exercise while retaining the needle.

Conclusions

Eye acupuncture has been substantially studied in China and seems to be a promising intervention used in the management of diverse pain conditions, and appeared to have no specific reported adverse events compared to other kinds of treatment. However, given the variety of study designs and reported treatment outcomes, conclusions about the evidence for eye acupuncture for specific conditions are not possible at this stage.

Availability of data and materials

The data used to support the findings of this study are included within the article and the supplementary information files. Additional data will be provided on a reasonable request to the first author.

Abbreviations

CDC:

Centers for Disease Control and Prevention

TCM:

Traditional Chinese Medicine

PRISMA:

Preferred Reporting Items for Systematic Reviews and Meta-Analyses

RCTs:

Randomized controlled trials

CCTs:

Controlled clinical trials

VAS:

Visual analogue scale

References

  1. Dowell D, Haegerich TM, Chou R. CDC guideline for prescribing opioids for chronic pain - United States, 2016. MMWR Recomm Rep. 2016;65(1):1–49. https://doi.org/10.15585/mmwr.rr6501e1.

    Article  PubMed  Google Scholar 

  2. Busse JW, Craigie S, Juurlink DN, Buckley DN, Wang L, Couban RJ, Agoritsas T, Akl EA, Carrasco-Labra A, Cooper L, Cull C, da Costa BR, Frank JW, Grant G, Iorio A, Persaud N, Stern S, Tugwell P, Vandvik PO, Guyatt GH. Guideline for opioid therapy and chronic noncancer pain. CMAJ. 2017;189(18):E659–66. https://doi.org/10.1503/cmaj.170363.

    Article  PubMed  PubMed Central  Google Scholar 

  3. Upadhyay J, Maleki N, Potter J, Elman I, Rudrauf D, Knudsen J, Wallin D, Pendse G, McDonald L, Griffin M, Anderson J, Nutile L, Renshaw P, Weiss R, Becerra L, Borsook D. Alterations in brain structure and functional connectivity in prescription opioid-dependent patients. Brain. 2010;133(Pt 7):2098–114. https://doi.org/10.1093/brain/awq138.

    Article  PubMed  PubMed Central  Google Scholar 

  4. Vivolo-Kantor AM, Puja S, Matthew RG, Christine LM, Grant TB, Aaron K-P, Coletta MA. Vital signs: trends in emergency department visits for suspected opioid overdoses — United States, July 2016–September 2017. MMWR Morb Mortal Wkly Rep. 2018;(67):279–85.

  5. Seth P, Rudd RA, Noonan RK, Haegerich TM. Quantifying the epidemic of prescription opioid overdose deaths. Am J Public Health. 2018;108(4):500–2. https://doi.org/10.2105/AJPH.2017.304265.

    Article  PubMed  PubMed Central  Google Scholar 

  6. Dyer O. US opioid overdoses rise by 30% in one year. BMJ. 2018;360:k1157.

    Article  PubMed  Google Scholar 

  7. Krebs EE, Gravely A, Nugent S, Jensen AC, DeRonne B, Goldsmith ES, Kroenke K, Bair MJ, Noorbaloochi S. Effect of opioid vs nonopioid medications on pain-related function in patients with chronic back pain or hip or knee osteoarthritis pain: the SPACE randomized clinical trial. JAMA. 2018;319(9):872–82. https://doi.org/10.1001/jama.2018.0899.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  8. Tsagareli M. Pain medicine: general view to the problem, vol. 2; 2017.

    Google Scholar 

  9. Edwards E, Belard JL, Glowa J, Khalsa P, Weber W, Huntley K. DoD-NCCAM/NIH workshop on acupuncture for treatment of acute pain. J Altern Complement Med. 2013;19(3):266–79.

    Article  PubMed  PubMed Central  Google Scholar 

  10. Kim KH, Ryu JH, Park MR, Kim YI, Min MK, Park YM, Kim YR, Noh SH, Kang MJ, Kim YJ, et al. Acupuncture as analgesia for non-emergent acute non-specific neck pain, ankle sprain and primary headache in an emergency department setting: a protocol for a parallel group, randomised, controlled pilot trial. BMJ Open. 2014;4(6).

  11. Yuan QL, Guo TM, Liu L, Sun F, Zhang YG. Traditional Chinese medicine for neck pain and low back pain: a systematic review and meta-analysis. PLoS One. 2015;10(2):e0117146. https://doi.org/10.1371/journal.pone.0117146.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  12. Mao JJ, Kapur R. Acupuncture in primary care. Prim Care. 2010;37(1):105–17. https://doi.org/10.1016/j.pop.2009.09.010.

    Article  PubMed  PubMed Central  Google Scholar 

  13. Wang PQ. Research on Peng Jing-Shan's eye-acupuncture therapy. Beijing: People’s Medical Publishing House; 2015.

    Google Scholar 

  14. Wang PQ, Ju QB, Zhou HF, Wang J. Exploration on the theoretical basis of eye acupuncture therapy based on literature clinical experiment–“eyes connect with the brain and regulate the viscera”. J Basic Chin Med. 2011;17(10):1133–1134+1139.

    Google Scholar 

  15. Yang T, Wang PQ. Exploration on the specificity of acupoints of eye-acupuncture based on meridian acupoints and anatomy. Hunan J Tradit Chin Med. 2014;30(4):99–101.

    CAS  Google Scholar 

  16. Peng JS. Eye-acupuncture therapy. Shenyang: Liaoning Science and Technology Press; 1990.

    Google Scholar 

  17. Wang PQ, Wang J, Zhou HF. The effect of eye-acupuncture on nerve function defect and plasma fibrinogen level in patients with acute cerebral infarction. Shanghai J Acup Moxib. 2008;3:5–7.

    Google Scholar 

  18. Xu JP, Wang J, Zhou HF. The effect of eye-acupuncture on plasma endothelin in patients with acute cerebral infarction. Chin Arch Tradit Chin Med. 2006;2:365–6.

    Google Scholar 

  19. Liu XD, Wang L, Wang YJ, Wang Z, Chai JY, Wang DS. The effects of eye-acupuncture combined with body acupuncture on hypothalamus and colon tissue substance P and neural excitation peptideIreceptor expression in the diarrheal irritable bowel syndrome rat. Chin J Gerontol. 2015;35(11):2890–3.

    CAS  Google Scholar 

  20. Shao Y, Wang PQ, Wang SD, Li CH. The effects of eye-acupuncture therapy combined with exercise therapy on VEGF protein and VEGF mRNA expression in cerebral ischemia reperfusion in rats with cerebral ischemia reperfusion. J Basic Chin Med. 2015;21(4):445–8.

    Google Scholar 

  21. Song SY, Wang DS, Wang YJ, Chai JY. The effect of eye-acupuncture on colon tissues and serum 5-HT and 5-HIAA in rats with irritable bowel syndrome model. Shanghai J Acup Moxib. 2010;29(6):339–41.

    Google Scholar 

  22. Wang J, Wang PQ. The effect of eye-acupuncture therapy on the study and memory impairment of vascular dementia rats and NOS activity in serum NO. Chin Arch Tradit Chin Med. 2007;3:485–6.

    Google Scholar 

  23. Xu HJ, Chen WD, Jiang HP, Liu LY. An anatomic study on acupoints area of eye acupuncture. Liaoning J Tradit Chin Med. 1989;43(1):41–3.

    Google Scholar 

  24. Munn Z, Peters MDJ, Stern C, Tufanaru C, McArthur A, Aromataris E. Systematic review or scoping review? Guidance for authors when choosing between a systematic or scoping review approach. BMC Med Res Methodol. 2018;18(1):143. https://doi.org/10.1186/s12874-018-0611-x.

    Article  PubMed  PubMed Central  Google Scholar 

  25. Moher D, Liberati A, Tetzlaff J, Altman DG, Group P. Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. Int J Surg. 2010;8(5):336–41. https://doi.org/10.1016/j.ijsu.2010.02.007.

    Article  PubMed  Google Scholar 

  26. Tricco AC, Lillie E, Zarin W, O'Brien KK, Colquhoun H, Levac D, Moher D, Peters MDJ, Horsley T, Weeks L, Hempel S, Akl EA, Chang C, McGowan J, Stewart L, Hartling L, Aldcroft A, Wilson MG, Garritty C, Lewin S, Godfrey CM, Macdonald MT, Langlois EV, Soares-Weiser K, Moriarty J, Clifford T, Tunçalp Ö, Straus SE. PRISMA extension for scoping reviews (PRISMA-ScR): checklist and explanation. Ann Intern Med. 2018;169(7):467–73. https://doi.org/10.7326/M18-0850.

    Article  PubMed  Google Scholar 

  27. Richardson WS, Wilson MC, Nishikawa J, Hayward RS. The well-built clinical question: a key to evidence-based decisions. ACP J Club. 1995;123(3):A12–3.

    Article  CAS  PubMed  Google Scholar 

  28. Cao YK, Liu ZD. Clinical observation of eye acupuncture combined with body acupuncture in the treatment of lumbago due to lumbar disc herniation. J Clin Acupunct Moxibustion. 2015;12:25–7.

    Google Scholar 

  29. Chang HZ, Lu JL, Yin SK. Report on 56 cases of acute lumbar sprain treated with eye acupuncture. Chin J Pract Nerv Dis. 2001;5:81.

    Google Scholar 

  30. Chang JY, Ma Q, Yue L. Clinical observation of 108 cases of acute gallbladder system pain treated by eye acupuncture. Chin Acupunct Moxibustion. 1996;1:4.

    Google Scholar 

  31. Chen JG, Tang YL. 80 cases of stiff neck treated by eye acupuncture combined with nape and back finger manipulation. People's Mil Surg. 2006;49(11):667–8.

    Google Scholar 

  32. Chen YF, Sun LY, Wang JM, Peng JS. Clinical observation of five kinds of pain syndrome treated with eye acupuncture. J Clin Acupunct Moxibustion. 1993;06:27–8.

    Google Scholar 

  33. Chu CL, Jiang XL. Chai Hu Shu Gan san combined with eye acupuncture in the treatment of 32 cases of menses headache in young women. Liaoning J Tradit Chin Med. 2015;42(5):1022–4.

    Google Scholar 

  34. Fu WB. Eye acupuncture as major therapy treating 136 cases of sciatica. Chin Acupunct Moxibustion. 1992;1:42.

    Google Scholar 

  35. Gao A. Clinical study on the treatment of irritable bowel syndrome (weakness of the spleen and stomach syndrome type) by eye acupuncture therapy. Master: Liaoning University of Traditional Chinese Medicine; 2013.

    Google Scholar 

  36. Gong NS. Observation on the curative effect of eye acupuncture on 98 cases of acute lumbar sprain. China’s Naturopathy. 1996;06:23.

    Google Scholar 

  37. Guan H. The clinical effect of eye acupuncture combined with Taohong Siwu decoction in the treatment of migraine. Master: Liaoning University of Traditional Chinese Medicine; 2012.

    Google Scholar 

  38. Han YB, Gao YW. Eye acupuncture therapy in treating 120 cases of low back pain. Shaanxi J Tradit Chin Med. 1989;4:181.

    Google Scholar 

  39. He Q. Clinical observation on treatment of posterior shoulder-hand syndrome after stroke with eye acupuncture and polarized light. Master: Liaoning University of Traditional Chinese Medicine; 2014.

    Google Scholar 

  40. He XJ. Eye acupuncture treating 68 cases of lumbar intervertebral disc herniation. Shanghai J Acupunct Moxibustion. 2000;03:31.

    CAS  Google Scholar 

  41. He Y. Clinical comparative study on the treatment of acute gouty arthritis by eye acupuncture and corresponding acupoint acupuncture. Master: Guangzhou University of Traditional Chinese Medicine; 2012.

    Google Scholar 

  42. Hu YL, Lin Q, Li Y, Zheng XM. The effect of eye acupuncture on PGF_(2α) in plasma of primary dysmenorrhea patients. Chin Acupunct Moxibustion. 2011;08:683–6.

    Google Scholar 

  43. Huang QF. Clinical observation of 30 cases of sciatica treated by eye acupuncture. J Clin Acupunct Moxibustion. 1992;6:35–6.

    Google Scholar 

  44. Huang XJ, Qin HJ, Xin J, Wang LL. Eye acupuncture combined with fu acupuncture in treating 170 cases of military training injuries. People’s Mil Surg. 2009;01:68.

    Google Scholar 

  45. Huang XJ, Xin J, Wang LL, Qin HJ. Clinical observation on the treatment of injury pain syndrome by eye acupuncture combined with fu acupuncture. Chin J Pract Chin Mod Med. 2008;6.

  46. Jiang LB, Yu XA. Eye acupuncture therapy in treating 35 cases of traumatic low back pain. Chin Acupunct Moxibustion. 1996;01:33.

    Google Scholar 

  47. Jin L. Clinical efficacy of eye acupuncture combined with traditional Chinese medicine in the treatment of headache in hyperactivity of liver-yang type. Master: Liaoning University of Traditional Chinese Medicine; 2011.

    Google Scholar 

  48. Jing SQ, Wang PQ. The treatment of headache by Peng’s eye acupuncture. Shanghai J Acupunct Moxibustion. 2015;11:1038–9.

    Google Scholar 

  49. Ju QB, Wang PQ. Clinical observation of analgesic technique for treating shoulder hand syndrome after stroke with eye acupuncture and ironing. J Basic Chin Med. 2016;(07):960–961+996.

  50. Ju YD, Ju YR, Chen SM. Acupuncture and medical treatment for 60 cases with periarthritis of shoulder. J Changchun Univ Chin Med. 2009;1:110–1.

    Google Scholar 

  51. Ju YR. The clinical application of eye acupuncture combined with body acupuncture and its experience. J Jinzhou Med Univ. 1999;06:54–5.

    Google Scholar 

  52. Leng JQ, Lin Q, Li Y, Hu YL. The effect of eye acupuncture on hemorheology of primary dysmenorrhea patients. Clin J Chin Medi. 2012;15:4–6.

    Google Scholar 

  53. Li HA. Eye acupuncture treatment of 52 cases with periarthritis of shoulder. Chin Acupunct Moxibustion. 1990;04:26.

    Google Scholar 

  54. Li MM. Study on analgesic effect of eye acupuncture on pain of lumbar spine disease. Chin Manipulation Rehabil Med. 2014;5(4):71–2.

    Google Scholar 

  55. Li MP, Wang QL. Clinical observation of 23 cases of sciatica treated by eye acupuncture. Chin Community Doctors. 1990;4:37.

    Google Scholar 

  56. Li YX. Eye acupuncture treatment of 110 cases of shoulder pain. Liaoning J Tradit Chin Med. 1986;1:29.

    Google Scholar 

  57. Li ZP, Lun X, Rong L. Eye acupuncture combined with acupoint injection for 40 cases of sciatica. Shanghai J Acupunct Moxibustion. 1996;1:156–7.

    Google Scholar 

  58. Lin B. Clinical observation of 50 cases with stiff neck treated by eye acupuncture. Fujian J Tradit Chin Med. 1997;06:25.

    CAS  Google Scholar 

  59. Lin Q, Chen WZ, Li Y, Hu YL. The effect of eye acupuncture on uterine artery blood flow of primary dysmenorrhea patients. Shanghai J Acupunct Moxibustion. 2012;12:885–7.

    Google Scholar 

  60. Lin Q, Chen XT, Chen WZ. Observation on the curative effect of eye acupuncture on cholelithiasis induced biliary colic. Clin J Chin Med. 2013;19:36–8.

    CAS  Google Scholar 

  61. Lin Q, Hu YL, Han CW, Li Y. Clinical observation on eye acupuncture for 90 cases of renal and ureteral colic caused by ureteral calculi. Shanghai J Acupunct Moxibustion. 2007;9:12–3.

    Google Scholar 

  62. Liu J. Study on the therapeutic effect evaluation and mechanism of the treatment of patients with irritable bowel syndrome in Ganyu Chengpi type. Master: Liaoning University of Traditional Chinese Medicine; 2013.

    Google Scholar 

  63. Liu YQ, Xu J, Yuan SH, Wen Q, Guo HW. Clinical observation of 37 cases of acute lumbar sprain treated with eye acupuncture. J Clin Acupunct Moxibustion. 1999;03:58–9.

    Google Scholar 

  64. Ma BD. Clinical observation of 46 cases of sicca syndrome treated by eye acupuncture. In: The sixteenth national conference on rheumatism by China Association of Chinese Medicine. Huangshan; 2012. p. 2.

  65. Mao L, Zhang W, Zhang MB. A randomized parallel controlled study on the treatment of migraine with eye acupuncture combined with scalp acupuncture. J Pract Tradit Chin Intern Med. 2014;07:148–50.

    Google Scholar 

  66. Meng QL. Eye acupuncture combined with scalp acupuncture treatment for 94 cases of migraine. J Clin Acupunct Moxibustion. 1990;6(3):20.

    Google Scholar 

  67. Ning WD. The experience of eye acupuncture with Xiaojie pills for the treatment of mammary lump. J Liaoning Univ Tradit Chin Med. 2007;02:106–7.

    Google Scholar 

  68. Niu WM. Observation on the effect of eye acupuncture on 100 cases of lumbago. J Ningxia Medi Univ. 1995;4:368.

    Google Scholar 

  69. Qin HJ. Treating 36 cases of herpes zostertreated by combination of eye acupuncture, body acupuncture and medicine. China Med Herald. 2011;31:121–2.

    Google Scholar 

  70. Qin HJ. 23 cases of trigeminal neuralgia treated by eye acupuncture combined with acupuncture and medicine. China Mod Med. 2013;5:111–2.

    Google Scholar 

  71. Song MX. Report on 124 cases of acute abdominal pain treated with eye acupuncture. J Emerg Tradit Chin Med. 1995;03:120–5.

    Google Scholar 

  72. Sui YJ, Wang J. Eye acupuncture combined with Yangxin Kuanxiongtang treating 65 cases of heart plant nerve function disorder. Chin J Tradit Chin Med. 2007;5(2):54–5.

    Google Scholar 

  73. Tang SS. Clinical observation of 31 cases of trigeminal neuralgia treated by eye acupuncture. Nei Mongol J Tradit Chin Med. 1999;3:31.

    Google Scholar 

  74. Tang SS. Clinical observation of 108 cases of biliary colic treated by eye acupuncture. J Guangxi Univ Chin Med. 2000;04:41–2.

    Google Scholar 

  75. Tian JL. The effect of eye acupuncture on the clinical efficacy and psychological factors of patients with irritable bowel syndrome. Master: Liaoning University of Traditional Chinese Medicine; 2012.

    Google Scholar 

  76. Tong Y, Wang PQ. Observation on the curative effect of eye acupuncture combined with thunder and fire moxibustion on 60 cases of shoulder and hand syndrome after stroke. Hunan J Tradit Chin Med. 2017;05:102–3.

    Google Scholar 

  77. Tu GQ, Zeng LQ. Clinical study on treatment of lumbar spinal stenosis with eye acupuncture and Tuina. Clin J Tradit Chin Med. 2017;12:2101–3.

    Google Scholar 

  78. Wang JH, Yang HO, Shuai KP, Pan Q, Mai DJ. Clinical observation of 122 cases of biliary colic treated by eye acupuncture. Chin Acupunct Moxibustion. 1989;02:27–8.

    Google Scholar 

  79. Wang KM. Clinical observation of acupuncture for the treatment of blood deficiency liver depression type tension headache. Master: Liaoning University of Traditional Chinese Medicine; 2011.

    Google Scholar 

  80. Wang ML, Li J, Jiang C. Eye acupuncture for dysmenorrhea. J Clin Acupunct Moxibustion. 1991;03:39–40.

    Google Scholar 

  81. Wang PQ, Chen SN, Liu YD, Chen XY, Wang J. Clinical study on 60 cases of diarrheal irritable bowel syndrome treated by eye acupuncture. J Tradit Chin Med. 2011;14:1203–6.

    Google Scholar 

  82. Wang Y. Study on the treatment of vascular headache by eye acupuncture and holographic therapy. J Pract Tradit Chin Intern Med. 1999;02:49.

    Google Scholar 

  83. Wang Y. Observation on clinical effect of eye acupuncture on headache in the type of hyperactivity of liver Yang. Master: Liaoning University of Traditional Chinese Medicine; 2016.

    Google Scholar 

  84. Wang Y, Wang PQ. Eye acupuncture combined with traditional Chinese medicine in the treatment of migraine: a randomized controlled observation. J Pract Tradit Chin Intern Med. 2013;1.

  85. Wang Y, Wang PQ. Clinical observation on 80 cases of blood stasis headache treated by eye acupuncture. J Pract Tradit Chin Intern Med. 2016;04:96–8.

    Google Scholar 

  86. Wang Y, Ye GA, Zhou H. Eye acupuncture for mixed hemorrhoids postoperative pain. Guide China Med. 2012;31:595–6.

    Google Scholar 

  87. Wang YJ, Wen TY, Qiu WJ. A comparative study on the treatment of lumbar intervertebral disc herniation by eye acupuncture and conventional acupuncture. Rheum Arthritis. 2015;01:32–4.

    Google Scholar 

  88. Wang ZC. Observation on the curative effect of eye acupuncture therapy combined with rehabilitation training on shoulder and hand syndrome after stroke. Master: Liaoning University of Traditional Chinese Medicine; 2014.

    Google Scholar 

  89. Xue AG. Treatment of 36 cases of lumbar intervertebral disc herniation by acupuncture. In: The ninth academic seminar of guangdong acupuncture society. Guangzhou; 2004. p. 2.

  90. Yan H, Zou KJ. Treatment of 52 cases of cervical spondylosis with eye acupuncture. Chin Acupunct Moxibustion. 1996;12:12.

    Google Scholar 

  91. Yang Y. Clinical observation of 60 cases of herpes zoster treated by eye needle and “hooping stitch” combined with semiconductor laser. Master: Hubei University of Chinese Medicine; 2013.

    Google Scholar 

  92. Yang ZB, Liu D, Chang YS, Qian H, Jia L. The clinical study of eye acupuncture and rood physical technique in the treatment of hemiplegic shoulder pain after stroke. Chin Med Mod Distance Educ China. 2015;19:77–9.

    Google Scholar 

  93. Yin SK. Eye acupuncture treatment of 90 cases of periarthritis of shoulder. Chin Acupunct Moxibustion. 1995;01:46.

    Google Scholar 

  94. Yuan HL, Liang LB, Huang JP, Li JH. Effect of acupuncture on forearm response points, combined with eye acupuncture and physiotherapy on acute stage of lumbar disc herniation. China Pract Med. 2017;17:1–3.

    Google Scholar 

  95. Zhan DQ, Li FL. Report on 102 cases of backache treated by eye acupuncture. J Clin Acupunct Moxibustion. 2000;4:34–5.

    Google Scholar 

  96. Zhang CM, Jiang YS. Clinical observation on the treatment of lumbar intervertebral disc herniation by eye acupuncture. Liaoning J Tradit Chin Med. 2004;11:956.

    Google Scholar 

  97. Zhang CY. Treatment of acute lumbar sprain with eye acupuncture. Heilongjiang J Tradit Chin Med. 1994;06:38.

    CAS  Google Scholar 

  98. Zhang HP. Eye acupuncture treatment on 92 cases of functional headache. Shaanxi J Tradit Chin Med. 1998;11:512.

    Google Scholar 

  99. Zhang JY. Clinical study of eye acupuncture therapy on acute gouty arthritis. Master: Guangzhou University of Traditional Chinese Medicine; 2008.

    Google Scholar 

  100. Zhang M, Wang Y. Treatment of achalasia of cardia with eye acupuncture combined with thunder and fire moxibustion. J Changchun Univ Chin Med. 2017;06:945–8.

    Google Scholar 

  101. Zhang O, Tian WZ. Treatment of primary dysmenorrhea by eye acupuncture therapy. J Clin Acupunct Moxibustion. 2008;01:25–6.

    Google Scholar 

  102. Zhang XF. Clinical study of eye acupuncture therapy for the treatment of headache in hyperactivity of liver-yang type. Master: Liaoning University of Traditional Chinese Medicine; 2012.

    Google Scholar 

  103. Zhao BM. Eye acupuncture combined with traditional Chinese medicine to treat thromboangiitis obliterans. Chin Acupunct Moxibustion. 1994;(S1):81–83+495.

  104. Zhao HY. Eye acupuncture combined with Canggui Tanxue technic for 40 cases with periarthritis of shoulder. Chin Med Mod Distance Educ China. 2012;09:34–5.

    CAS  Google Scholar 

  105. Zhao X, Wang PQ. Observation on the therapeutic effect of eye acupuncture and body acupuncture on thalamic pain. Shanghai J Acupunct Moxibustion. 2016;7:805–7.

    Google Scholar 

  106. Zheng KL. Clinical observation on 35 cases of stiff neck treated by massage and eye acupuncture. Hebei J Tradit Chin Med. 2013;1:83–4.

    Google Scholar 

  107. Zhou J. Clinical study on the treatment of migraine using eye acupuncture combined with body acupuncture. Master: Liaoning University of Traditional Chinese Medicine; 2008.

    Google Scholar 

  108. Zhu FS, Cao LH. Clinical observation of 100 cases of headache treated by eye acupuncture. J Clin Acupunct Moxibustion. 1992;01:38.

    Google Scholar 

  109. Merskey H, Bogduk N. Classification of chronic pain. 2nd ed. Seattle: IASP Press; 1994.

    Google Scholar 

  110. Treede RD, Rief W, Barke A, Aziz Q, Bennett MI, Benoliel R, Cohen M, Evers S, Finnerup NB, First MB, Giamberardino MA, Kaasa S, Kosek E, Lavand'homme P, Nicholas M, Perrot S, Scholz J, Schug S, Smith BH, Svensson P, Vlaeyen JWS, Wang SJ. A classification of chronic pain for ICD-11. Pain. 2015;156(6):1003–7. https://doi.org/10.1097/j.pain.0000000000000160.

    Article  PubMed  PubMed Central  Google Scholar 

  111. Sayre JW, Toklu HZ, Ye F, Mazza J, Yale S. Case reports, case series – from clinical practice to evidence-based medicine in graduate medical education. Cureus. 2017;9(8):e1546. https://doi.org/10.7759/cureus.1546.

  112. van der Glas HW, van Grootel RJ. The index ‘treatment duration control’ for enabling randomized controlled trials with variation in duration of treatment of chronic pain patients. BMC Med Res Methodol. 2013;13(1):123. https://doi.org/10.1186/1471-2288-13-123.

    Article  PubMed  PubMed Central  Google Scholar 

  113. Kim HS, Choi JW, Chang SH, Lee KS, Oh JY. Treatment duration and cost of work-related low Back pain in Korea. J Korean Med Sci. 2005;20(1):127–31. https://doi.org/10.3346/jkms.2005.20.1.127.

    Article  PubMed  PubMed Central  Google Scholar 

  114. Shang JS, Li YD, Zhang J. Measures prevent bleeding in eye-acupuncture therapy. J Clin Acup Mox. 1994;3:34–5.

    Google Scholar 

  115. Nijs J, Lluch Girbes E, Lundberg M, Malfliet A, Sterling M. Exercise therapy for chronic musculoskeletal pain: innovation by altering pain memories. Man Ther. 2015;20(1):216–20. https://doi.org/10.1016/j.math.2014.07.004.

    Article  PubMed  Google Scholar 

  116. Lucchetti G, Oliveira AB, Mercante JP, Peres MF. Anxiety and fear-avoidance in musculoskeletal pain. Curr Pain Headache Rep. 2012;16(5):399–406. https://doi.org/10.1007/s11916-012-0286-7.

    Article  PubMed  Google Scholar 

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Acknowledgements

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Funding

NR is funded by Overseas Expertise Project, Ministry of Education of China (No. G20190001122). This work was supported by the key project of National Natural Science Foundation project of China (No. 81830115).

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Authors and Affiliations

  1. Centre for Evidence-Based Chinese Medicine, Beijing University of Chinese Medicine, 11 Bei San Huan Dong Lu, Chaoyang District, Beijing, 100029, China

    Yuan Chi, Nicola Robinson & Jian-Ping Liu

  2. Institute for Complementary and Integrative Medicine, University Hospital Zurich and University of Zurich, Zurich, Switzerland

    Jürgen Barth

  3. School of Basic Medicine, Liaoning University of Traditional Chinese Medicine, Shenyang, China

    Mei Wang

  4. Institute of Health and Social Care, London South Bank University, London, UK

    Nicola Robinson

  5. Department of Pain Management, The Second Hospital of Shandong University, Jinan, China

    Zan-Hua Li

  6. Institute of Integrated Traditional Chinese Medicine and Western Medicine, Guangzhou Medical University, Guangzhou, China

    Jian-Ping Liu

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Contributions

YC and JL conceived the review. YC did the systematic search, study selection, and data extraction. YC and MW conducted the statistical analyses. ZL provided clinical input on pain. YC, JB and NR drafted the manuscript with interpretation and critical revision from all authors. NR edited the language. All authors reviewed and approved the final manuscript.

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Correspondence to Jian-Ping Liu.

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Chi, Y., Barth, J., Wang, M. et al. Eye acupuncture for pain conditions: a scoping review of clinical studies. BMC Complement Med Ther 21, 101 (2021). https://doi.org/10.1186/s12906-021-03272-8

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BMC Complementary Medicine and Therapies

ISSN: 2662-7671

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