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Table 2 Asthenopia questionnaire form modified from the original version proposed by Ames et al.

From: The effect of Vaccinium uliginosum extract on tablet computer-induced asthenopia: randomized placebo-controlled study

Symptom

None

Slight

Moderate

Severe

Tired eyes

0

1

2

3

4

5

6

Sore/aching eyes

0

1

2

3

4

5

6

Irritated eyes

0

1

2

3

4

5

6

Watery eyes

0

1

2

3

4

5

6

Dry eye

0

1

2

3

4

5

6

Eye strain

0

1

2

3

4

5

6

Hot/burning eyes

0

1

2

3

4

5

6

Blurred vision

0

1

2

3

4

5

6

Difficult focusing

0

1

2

3

4

5

6

Visual discomfort

0

1

2

3

4

5

6