Visual acuity measurement and ocular co-morbidity in diabetic retinopathy screening

Scanlon, Peter H and Foy, C and Chen, F K (2008) Visual acuity measurement and ocular co-morbidity in diabetic retinopathy screening. British Journal of Ophthalmology, 92 (6). pp. 775-778. ISSN 0007-1161

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Abstract

AIMS: To evaluate the relationship between best corrected visual acuity (BCVA), age, type of diabetes, sight-threatening diabetic retinopathy (STDR) and ocular co-morbidity. METHODS: 1549 randomly selected people with diabetes mellitus (DM) from a countywide digital photographic screening programme had standardised logarithm of minimum angle of resolution (logMAR) BCVA measurement, followed by slit-lamp biomicroscopy examination by an experienced ophthalmologist. RESULTS: Subnormal vision (logMAR > or =0.3, Snellen < or =6/12) and blindness (logMAR >1.3, Snellen <3/60) in the better-seeing eye were found in 9.0% and 0.45%. The sensitivity, specificity and positive and negative predictive values of using subnormal vision to screen for STDR in an individual eye were 33.4%, 85.9%, 18.6% and 93.0%, respectively. Important contributory causes of moderate visual loss (logMAR 0.50 to 0.98, Snellen 6/18 or worse but better than 6/60) and of Acuity Blindness (logMAR > or =1.0, Snellen 6/60 or worse) in an individual eye were lenticular opacity (including capsular opacification) 49%, macular degeneration (including myopic degeneration) 29%, diabetic maculopathy 15%, other media causes (including corneal opacity) 13% and amblyopia 10%. CONCLUSION: The majority of visual loss in a population with diabetes is due to causes other than diabetic retinopathy. BCVA alone is not a reliable criterion in predicting STDR.

Item Type: Article
Article Type: Article
Subjects: R Medicine > RE Ophthalmology
Divisions: Schools and Research Institutes > School of Sport & Exercise
Research Priority Areas: Sport, Exercise, Health & Wellbeing
Depositing User: Anne Pengelly
Date Deposited: 23 Mar 2016 12:19
Last Modified: 23 Mar 2016 12:19
URI: http://eprints.glos.ac.uk/id/eprint/3293

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