| ORIGINAL ARTICLE
|Year : 2005 | Volume
| Issue : 2 | Page : 112-115
A customised portable LogMAR chart with adjustable chart illumination for use as a mass screening device in the rural population
M Gouthaman, RP Raman, A Kadambi, R Padmajakumari, PG Paul, Tarun Sharma
Sankara Nethralaya,18, College Road, Chennai - 600006, Tamil Nadu, India
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.
Sankara Nethralaya,18, College Road, Chennai - 600006, Tamil Nadu
Source of Support: None, Conflict of Interest: None
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