Rapid assessment of avoidable blindness and diabetic retinopathy in Taif, Saudi Arabia.


Al Ghamdi, AH; Rabiu, M; Hajar, S; Yorston, D; Kuper, H; Polack, S; (2012) Rapid assessment of avoidable blindness and diabetic retinopathy in Taif, Saudi Arabia. The British journal of ophthalmology, 96 (9). pp. 1168-72. ISSN 0007-1161 DOI: https://doi.org/10.1136/bjophthalmol-2012-301874

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Abstract

BACKGROUND/AIMS: To estimate the prevalence of blindness, diabetes and diabetic retinopathy (DR) in Taif, Saudi Arabia using the Rapid Assessment of Avoidable Blindness (RAAB) framework. METHODS: 66 clusters of 50 people aged ?50 years were randomly selected. Participants underwent visual acuity measurement and examination by an ophthalmologist. DR among diabetic participants (previous diagnosis and/or random blood glucose >200 mg/dl) was assessed through dilated fundus examination by an ophthalmologist using a direct and indirect ophthalmoscope ('clinical examination') and dilated digital fundus photographs graded by a retinal specialist following the Scottish DR grading system ('reference standard'). RESULTS: 3052 (93%) out of 3300 eligible people were examined. The prevalence of blindness was 2.6% (95% CI 2.0% to 3.2%). Posterior segment diseases (44%) and cataract (41%) were the leading causes of blindness. The estimated prevalence of diabetes was 29.7% (28.1% to 31.4%), among whom the prevalence of DR was 36.8% (33.3% to 40.2%) and sight-threatening DR (STDR) was 17.5% (CI 15.1% to 20.0%). Agreement was good (?>0.6) between the clinical examination and reference standard for any DR and STDR. CONCLUSIONS: There was a high prevalence of diabetes, DR and STDR. It was possible to assess diabetes and DR within RAAB but it increased the survey duration, cost and complexity.

Item Type: Article
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Clinical Research
Research Centre: The International Centre for Evidence in Disability
International Centre for Eye Health
Centre for Global Non-Communicable Diseases (NCDs)
PubMed ID: 22790436
Web of Science ID: 308674500004
URI: http://researchonline.lshtm.ac.uk/id/eprint/230674

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