Capabilities of potential vision test measurements - clinical evaluation in the presence of cataract or macular disease.

Description

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.

Links & Downloads

1. Vianya-Estopa, M., Douthwaite, W.A., Noble, B. and Elliott, D.B. (2006). Capabilities of potential vision test measurements - clinical evaluation in the presence of cataract or macular disease. Journal of Cataract and Refractive Surgery. Vol. 32, No. 7, pp. 1151-1162.
2. http://hdl.handle.net/10454/3812
3. https://doi.org/10.1016/j.jcrs.2006.01.111

Tags

Potential vision tests

PVTs

Cataracts

Macular disease

Additional Fields

Identifer	oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/3812
Date	January 2007
Creators	Vianya-Estopa, Marta, Douthwaite, William A., Noble, B.A., Elliott, David
Source Sets	Bradford Scholars
Language	English
Detected Language	English
Type	Article, No full-text in the repository