Vision-specific variables of study patients: visual acuity was assessed with the Early Treatment Diabetic Retinopathy Study (ETDRS) Chart; disability was assessed with the National Eye Institute Visual Functioning Questionnaire-25 (NEI-VFQ-25), range 0 to 100 (0 represents worst, 100 represents best possible visual functioning); table n = 169.

<p>*) Missing information for all items ranged from 6 to 8, except for “Driving” which was unanswered in 83 cases.</p><p>Vision-specific variables of study patients: visual acuity was assessed with the Early Treatment Diabetic Retinopathy Study (ETDRS) Chart; disability was assessed with the National Eye Institute Visual Functioning Questionnaire-25 (NEI-VFQ-25), range 0 to 100 (0 represents worst, 100 represents best possible visual functioning); table n = 169.