Evaluation Report – The Cambridge Video Refractor

Cathie M Searle, DOBA 1983, DipAppSci (Cumb)
Ross C Miller, FRACO, FRACS
Katrina M Bourne, DOBA 1987, DipAppSci(Cumb)
Ann M Crampton, DOBA 1984, DipAppSci(Cumb)

Photoscreening is a technique that has been developed in an attempt to refine vision screening programmes which aim to identify visual disorders in early childhood. Various groups have developed photorefracting tools in recent years. This study evaluated the role of one such tool-the Cambridge Video Refractor (CVR)
The CVR is an isotropic on-axis photorefractor, which utilises a computerised system to evaluate three photographs of a subjects eyes and predict refractive error.
When the results of video refraction on 101 non cyclopledged eyes were conquered with their retinoscopic refraction, 41/6%of the CVR predictations were correct. The video refraction of 83 cyclopedged eyes were compared to the retinoscopic refraction, and the accuracy of the CVR was 51.8%. For the evaluation the video refraction prediction was within 1.0D and the axis 20 of the retinoscopic refraction to be considered accurate.