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Journal of Postgraduate Medicine
Medknow Publications and Staff Society of Seth GS Medical College and KEM Hospital, Mumbai, India
ISSN: 0022-3859 EISSN: 0022-3859
Vol. 51, No. 2, 2005, pp. 112-115
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Bioline Code: jp05044
Full paper language: English
Document type: Research Article
Document available free of charge
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Journal of Postgraduate Medicine, Vol. 51, No. 2, 2005, pp. 112-115
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A customised portable LogMAR chart with adjustable chart illumination for use as a mass screening device in the rural population
Gouthaman M., Raman R.P., Kadambi A., Padmajakumari R., Paul P.G., Sharma Tarun
Abstract
Aim: To develop a customised, portable, cost-effective (logarithmic minimal angle resolution) LogMAR chart with adjustable illumination for use as a mass vision-screening device in the rural population.
Materials and Methods : Visual acuity of 100 individuals was evaluated with a customised chart and compared with the standard Early Treatment Diabetic Retinopathy Study (ETDRS) chart and Snellen′s Chart. Bland and Altman analytical techniques were used for analysis.
Results: Test-retest variability of the customised chart was just a one-line difference (95% CI for agreement), and so were the results with the standard ETDRS charts; a variability of 3-line was noted with Snellen′s chart. Two-line differences were observed when comparison was made with Standard ETDRS chart and 2 to 3-line differences with Snellen′s chart.
Conclusion: The customised portable LogMAR chart with adjustable illumination shows less test-retest variability and better agreement with standard ETDRS chart; therefore, it can be used as a mass vision-screening device in rural settings.
Keywords
Customised logMAR chart, ETDRS chart, vision-screening device
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