A customised portable LogMAR chart with adjustable chart illumination for use as a mass screening device in the rural population

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 an...

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Veröffentlicht in:Journal of postgraduate medicine (Bombay) 2005-04, Vol.51 (2), p.112-114
Hauptverfasser: Gouthaman, M, Raman, R P, Kadambi, A, Padmajakumari, R, Paul, P G, Sharma, T
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container_end_page 114
container_issue 2
container_start_page 112
container_title Journal of postgraduate medicine (Bombay)
container_volume 51
creator Gouthaman, M
Raman, R P
Kadambi, A
Padmajakumari, R
Paul, P G
Sharma, T
description 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.
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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. 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source MEDLINE; Bioline International; EZB-FREE-00999 freely available EZB journals
subjects Adult
Aged
Aged, 80 and over
Customised logMAR chart, ETDRS chart, vision-screening device
Female
Humans
India
Male
Measurement
Medical examination
Middle Aged
Reproducibility of Results
Rural Health Services
Rural Population
Testing
Vision
Vision Screening - instrumentation
Visual acuity
title A customised portable LogMAR chart with adjustable chart illumination for use as a mass screening device in the rural population
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