Development and validation of a vision-specific quality-of-life questionnaire for Timor-Leste

Abstract

PURPOSE. To develop and determine the reliability and validity of a vision-specific quality-of-life instrument (TL-VSQOL) designed to assess the impact of distance and near vision impairment in adults living in Timor-Leste. METHODS. A vision-specific quality-of-life questionnaire was developed, piloted, and administered to 704 Timorese aged ≥40 years during a population-based eye health rapid assessment. Rasch analysis was performed on the data of 457 participants with presenting near vision worse than N8 (78.5%) and/or distance vision worse than 6/18 (69.8%). Unidimensionality, item fit to the model, response category performance, differential item functioning, and targeting of items to par..