Abstract

A large-scale, cooperative effort to evaluate cryotherapy for retinopathy of prematurity (ROP) (stage III) is in progress and initial positive results of this trial have been reported (1). One component in the evaluation of outcome is grating acuity measured by the Teller Acuity Card (TAC) procedure (2). However, infants with more advanced ROP (stages IV-V) often do not have measurable TAC acuity (3, 4), yet, in clinical experience, react to light and may be capable of visually guided behavior. New studies are anticipated that will evaluate surgical intervention that may minimize disease progression in eyes with advanced ROP (eg. 5-7). These studies will need to employ measures of visual outcome that are appropriate for the functional level of vision of treated eyes.

© 1990 Optical Society of America