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


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.


CONCLUSIONS
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.
Gouthaman
M
M
Sankara Nethralaya, 18 College Road, Chennai-600006, Tamil Nadu, India.
Raman
R P
RP
Kadambi
A
A
Padmajakumari
R
R
Paul
P G
PG
Sharma
T
T
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D019035:Rural Health Services; D012424:Rural Population; D015351:Vision Screening / Q000295:instrumentation*