Development of the 25-list-item National Eye Institute Visual Function Questionnaire

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Abstract
HEALTH-RELATED quality of life (HRQOL) measures functioning and well-being in physical, mental, and social health realms of life and reflects the influence of a broad range of health conditions simultaneously. Because of the response burden and impact on participation rates, it is imperative that HRQOL measures be as short as feasible. Recognition of the important role that survey length plays in both data quality and costs has led to the creation of short-form versions of health surveys such as the 18-list-item version of the Patient Satisfaction Questionnaire,1 the 5-list-item version of the Mental Health Inventory,2 and the 36-list-item Short-Form Health Survey3 and 12-list-item Short-Form Health Survey.4 There is even greater need for short-form versions of vision-targeted surveys such as the National Eye Institute Visual Function Questionnaire (NEI VFQ),5 because to comprehensively evaluate HRQOL requires the use of vision-targeted measures in combination with generic measures.