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The Pakistan national blindness and visual impairment survey--research design, eye examination methodology and results of the pilot study.
Ophthalmic Epidemiol 2005; 12(5):321-33OE

Abstract

PURPOSE

To establish age- and sex-specific prevalence rates and causes of blindness and low vision in children aged 10 to 15 years and adults aged 30 years and older in Pakistan.

METHODS

Multi-stage, stratified (rural/urban), cluster random sampling, with probability proportional-to-size procedures, was utilised to select a cross-sectional, nationally representative sample of adults (16,600 subjects) and children (6,000 subjects). Each subject underwent: interview, visual acuity (logMAR), autorefraction and optic disc examination. Those that saw < 6/12 in either eye underwent corrected visual acuity and dilated posterior segment examination.

RESULTS

The results of a pilot survey are reported in this paper. In the two rural pilot sites, 159 subjects (including 47 children) were examined; 50% were male. Thirty seven adults (23.3%) but no children saw worse than 6/12 in either eye. Two subjects were blind (corrected visual acuity) in the better eye, and 11 were visually impaired. Refractive error was the main cause (in 22 eyes (39% of the total of 56 eyes)) of < 6/12 visual acuity, followed by cataract (12 eyes), uncorrected aphakia (6 eyes) and age-related macular disease (3 eyes).

CONCLUSIONS

The pilot survey demonstrated that the proposed examination process for the main survey is feasible. Particular strengths of this survey include the use of logMAR visual acuity testing and autorefraction of all subjects, a dilated posterior segment examination, and the use of a 'less than 6/12' threshold for further examination. This lower threshold addresses the burden of refractive error, which, with cataract, are two of the diseases specifically targeted by Vision 2020.

Authors+Show Affiliations

Clinical Research Unit, Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, England, UK. rupert.bourne@lshtm.ac.uk

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16272052

Citation

Bourne, Rupert, et al. "The Pakistan National Blindness and Visual Impairment Survey--research Design, Eye Examination Methodology and Results of the Pilot Study." Ophthalmic Epidemiology, vol. 12, no. 5, 2005, pp. 321-33.
Bourne R, Dineen B, Jadoon Z, et al. The Pakistan national blindness and visual impairment survey--research design, eye examination methodology and results of the pilot study. Ophthalmic Epidemiol. 2005;12(5):321-33.
Bourne, R., Dineen, B., Jadoon, Z., Lee, P. S., Khan, A., Johnson, G. J., ... Khan, D. (2005). The Pakistan national blindness and visual impairment survey--research design, eye examination methodology and results of the pilot study. Ophthalmic Epidemiology, 12(5), pp. 321-33.
Bourne R, et al. The Pakistan National Blindness and Visual Impairment Survey--research Design, Eye Examination Methodology and Results of the Pilot Study. Ophthalmic Epidemiol. 2005;12(5):321-33. PubMed PMID: 16272052.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The Pakistan national blindness and visual impairment survey--research design, eye examination methodology and results of the pilot study. AU - Bourne,Rupert, AU - Dineen,Brendan, AU - Jadoon,Zahid, AU - Lee,Pak S, AU - Khan,Aman, AU - Johnson,Gordon J, AU - Foster,Allen, AU - Khan,Daud, AU - ,, PY - 2005/11/8/pubmed PY - 2005/12/13/medline PY - 2005/11/8/entrez SP - 321 EP - 33 JF - Ophthalmic epidemiology JO - Ophthalmic Epidemiol VL - 12 IS - 5 N2 - PURPOSE: To establish age- and sex-specific prevalence rates and causes of blindness and low vision in children aged 10 to 15 years and adults aged 30 years and older in Pakistan. METHODS: Multi-stage, stratified (rural/urban), cluster random sampling, with probability proportional-to-size procedures, was utilised to select a cross-sectional, nationally representative sample of adults (16,600 subjects) and children (6,000 subjects). Each subject underwent: interview, visual acuity (logMAR), autorefraction and optic disc examination. Those that saw < 6/12 in either eye underwent corrected visual acuity and dilated posterior segment examination. RESULTS: The results of a pilot survey are reported in this paper. In the two rural pilot sites, 159 subjects (including 47 children) were examined; 50% were male. Thirty seven adults (23.3%) but no children saw worse than 6/12 in either eye. Two subjects were blind (corrected visual acuity) in the better eye, and 11 were visually impaired. Refractive error was the main cause (in 22 eyes (39% of the total of 56 eyes)) of < 6/12 visual acuity, followed by cataract (12 eyes), uncorrected aphakia (6 eyes) and age-related macular disease (3 eyes). CONCLUSIONS: The pilot survey demonstrated that the proposed examination process for the main survey is feasible. Particular strengths of this survey include the use of logMAR visual acuity testing and autorefraction of all subjects, a dilated posterior segment examination, and the use of a 'less than 6/12' threshold for further examination. This lower threshold addresses the burden of refractive error, which, with cataract, are two of the diseases specifically targeted by Vision 2020. SN - 0928-6586 UR - https://www.unboundmedicine.com/medline/citation/16272052/The_Pakistan_national_blindness_and_visual_impairment_survey__research_design_eye_examination_methodology_and_results_of_the_pilot_study_ L2 - http://www.tandfonline.com/doi/full/10.1080/09286580500230948 DB - PRIME DP - Unbound Medicine ER -