Development of a refractive error quality of life scale for Thai adults (the REQ-Thai).

Objective: To develop a scale for measuring refractive error quality of life (QOL) for Thai adults.

Material And Method: The full survey comprised 424 respondents from 5 medical centers in Bangkok and from 3 medical centers in Chiangmai, Songkla and KhonKaen provinces. Participants were emmetropes and persons with refractive correction with visual acuity of 20/30 or better An item reduction process was employed by combining 3 methods-expert opinion, impact method and item-total correlation methods.