Abstract
Purpose :
To compare the best corrected visual acuity (BCVA) estimated with a digital visual acuity chart, the AxAnIvIs system, and with the ETDRS chart at different visual acuity classes.
Methods :
Total 26 subjects ≥ 55 years were divided into 4 visual acuity classes of [1.0 0.8], [0.7 0.5], [0.4 0.2] and [0.1 -0.1] logMAR. The BCVA of each subject was measured with both the ETDRS chart and the AxAnIvIs system on two separate occasions. The examination time, spherical error, cylindrical error and axis angle were recorded.
Results :
The estimated 95% CI for the mean BCVA difference between two charts (AxAnIvIs – ETDRS) was -0.03±0.03 logMAR. No systematic difference between the charts was found (Test statistic = 2.60, F1,16,0.95 = 4.49), and there was no statistically significant difference between the charts depending on visual acuity class (Test statistic = 0.67, F3,8,0.95 = 3.24). The examination time for the AxAnIvIs system was 40s shorter than that for the ETDRS chart.
Conclusions :
The findings that no significant difference between the two charts, and no significant difference between the charts depending on visual acuity class indicate the AxAnIvIs system can be an alternative of the ETDRS chart. This digital system has shorter testing time compared to the ETDRS chart
This is a 2021 ARVO Annual Meeting abstract.