Table 2.

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

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