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Prediction of postoperative outcome in cataract subjects: A pre and postoperative studyDouthwaite, William A., Vianya-Estopa, Marta, Elliott, David 11 1900 (has links)
Yes / 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. / Federation of Ophthalmic and Dispensing Opticians
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Capabilities of potential vision test measurements - clinical evaluation in the presence of cataract or macular disease.Vianya-Estopa, Marta, Douthwaite, William A., Noble, B.A., Elliott, David January 2007 (has links)
No / Purpose
To determine the usefulness of a battery of potential vision tests (PVTs) including potential acuity meter (PAM), laser interferometer (LI), critical flicker/fusion frequency (CFF), superilluminated pinhole at distance (SPHd) and near (SPHn), and optimal reading speed (ORS) by their independence of the effects of cataracts and sensitivity to macular disease (MD).
Setting
Department of Optometry, University of Bradford, Bradford and Leeds General Infirmary, Leeds, United Kingdom.
Methods
Potential vision test measurements were determined in 76 patients with age-related cataract and no other eye disease, 52 patients with MD and clear ocular media, and 28 patients with normal, healthy eyes.
Results
Potential vision tests were independent of the degrading effects of cataract up to a visual acuity (VA) level of 20/200 or worse (CFF), 20/125 (ORS and SPH), and 20/40 (PAM and LI). A high degree of association was found between PVT scores and distance VA in the MD group for SPHd (r2 = 0.93), SPHn (r2 = 0.89), and PAM (r2 = 0.71). A moderate correlation was found for LI (r2 = 0.55), CFF (r2 = 0.50), and ORS (r2 = 0.45).
Conclusions
Potential acuity meter and LI showed very limited independence to moderate/dense cataracts and inaccurate predictions in patients with MD. Superilluminated pinhole was relatively unaffected by moderate/dense cataract and yet provided accurate predictions in the presence of MD and clear ocular media. Critical flicker/fusion frequency showed the greatest ability to bypass cataracts, although its ability to predict VA in patients with early MD was limited. The ORS was relatively unaffected by moderate/dense cataract, but its poor ability to predict VA in MD may limit its clinical suitability as a PVT.
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