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1 General aspects (0)   1.1 Epidemiology (20)   1.2 Population genetics (3)   1.3 Pathogenesis (0)   1.4 Quality of life (7)   1.5 Glaucomas as cause of blindness (8)   1.6 Prevention and screening (8) 2 Anatomical structures in glaucoma (0)   2.1 Conjunctiva (8)   2.2 Cornea (27)   2.3 Sclera (2)   2.4 Anterior chamber angle (2)   2.5 Meshwork (0)     2.5.1 Trabecular meshwork (8)     2.5.2 Schlemms canal (3)     2.5.3 Scleral outlet channels (0)   2.6 Aqueous humor dynamics (0)     2.6.1 Production (2)     2.6.2 Outflow (1)       2.6.2.1 Trabecular meshwork (5)       2.6.2.2 Uveoscleral (0)     2.6.3 Compostion (8)   2.7 Episcleral veins and venous pressure (0)   2.8 Iris (4)   2.9 Ciliary body (1)   2.10 Lens (1)   2.11 Vitreous body (1)   2.12 Choroid, peripapillary choroid, peripapillary atrophy (3)   2.13 Retina and retinal nerve fibre layer (22)   2.14 Optic disc (22)   2.15 Optic nerve (1)   2.16 Chiasma and retrochiasmal central nervous system (4)   2.17 Stem cells (2)   2.20 Other (0) 3 Laboratory methods (0)   3.1 Microscopy (2)   3.2 Electron microscopy (2)   3.3 Immunohistochemistry (5)   3.4 Molecular genetics (0)     3.4.1 Linkage studies (1)     3.4.2 Gene studies (36)   3.5 Molecular biology incl. 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pharmacoeconomics (6) 15 Miscellaneous (25)

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Abstract #27320 Published in IGR 12-4

Prevalence and causes of blindness, low vision and status of cataract in 50 years and older citizen of Qatar-A community based survey

Gamra HA; Mansouri FA; Khandekar R; Elshafei M; Qahtani OA; Singh R; Hashim SP; Mujahed A; Makled A; Pai A
Ophthalmic Epidemiology 2010; 17: 292-300

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Background: Rapid Assessment for the Avoidable Blindness (RAAB) was conducted in Qatar during 2009. We present the prevalence and determinants of visual disabilities and status of cataract among citizens aged 50 years and older. Methods: Residents of randomly selected houses and clusters participated in the survey. Opticians noted the presenting and the best corrected vision of participants from 49 clusters. Ophthalmologists examined participants with additional instruments like bio-microscope, digital camera, auto-perimeter and auto-refractor in a mobile van. World Health Organization recommended principal cause of blindness (Visual acuity [VA]<3/60 in better eye), Severe visual impairment (SVI) (<6/60), low vision (VA<6/18) and unilateral blindness (VA<3/60) were designated. Persons with VA<6/18 and cataract were interviewed to calculate coverage and barriers for cataract surgeries. Age sex adjusted prevalence of visual disabilities and their 95% Confidence Intervals (CI) were estimated. Results: We examined 2,433 (97.3%) participants. The age sex adjusted prevalence of bilateral blindness was 1.28% [95% CI 1.221.35], SVI (1.67%), low vision (3.66%) and unilateral blindness (3.61%) in 50 years and older population. Female and older age groups were significant risk factors of visual disabilities. Cataract and glaucoma were the main causes of visual disabilities. The coverage of cataract services was 68.2%. Believing that cataract as an aging process (25) and adequate vision in the fellow eye (15) were the reasons for delay in surgery. Conclusions: To reduce avoidable blindness, un-operated cataract should be addressed. Primary and secondary eye care systems should be strengthened to improve the care of blinding eye diseases in Qatar. (copyright) 2010 Informa Healthcare USA, Inc.

H. A. Gamra. Department of Ophthalmology, Hamad Medical Corpora, Section of Ophthalmology, Doha, Qatar. halnabit@hmc.org.qa

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Classification:

1.1 Epidemiology (Part of: 1 General aspects)
1.5 Glaucomas as cause of blindness (Part of: 1 General aspects)

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