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Predictions of postoperative visual outcome in subjects with cataract: a preoperative and postoperative study.

Douthwaite WA, Vianya-Estopà M, Elliott DB

Department of Optometry, University of Bradford, Bradford, West Yorkshire BD7 1DP, UK. w.a.douthwaite@bradford.ac.uk

AIM: To assess the ability of critical flicker frequency (CFF) and optimal reading speed (ORS) to predict the potential vision in patients with cataract with and without ocular comorbidity. METHODS: The two novel tests were compared with two well established potential vision tests (PVTs), the potential acuity meter (PAM) and the laser interferometer (LI). Measurements were made preoperatively in 1 eye of 88 subjects using the battery of 4 PVTs. Postoperative measurements were made with the CFF and the ORS. The subjects studied were consecutive cases over a 12-month period who fulfilled the inclusion and exclusion criteria, and agreed to participate in this study. RESULTS: CFF was the PVT most resistant to the presence of cataract. Both CFF and ORS give a similar predictive precision in the presence of cataract and ocular comorbidity, although CFF seems more precise when the cataract is dense. CONCLUSIONS: The PAM and the LI showed a limited clinical capability in predicting postoperative visual acuity, particularly with dense opacities. The CFF shows the most promise as a PVT, particularly with dense cataract. Further evaluation is required for both CFF and ORS.

Published 20 April 2007 in Br J Ophthalmol, 91(5): 638-43.
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