This article discusses the importance of self-reported visual function and quality of life (QOL) assessment in evaluating the effectiveness of eye care and prevention of blindness interventions. Traditional clinical measurements do not provide an adequate characterization of the burden of visual disability faced by the patient in day-to-day activities. The validity, reliability and responsiveness of QOL questionnaires should be demonstrated before general use of such instruments is advocated. A visual function questionnaire currently undergoing psychometric evaluation as part of a clinical study of cataract surgery in India is presented.