Table 2.
Comparison of conventional and tablet-based test for each vision metric, (N=82)
| Vision Test Metric | Standard test, mean (SD) | Tablet test, mean (SD) | Differencea, mean (SD) | 95% LOA | rb |
|---|---|---|---|---|---|
| Distance visual acuity (ETDRS vs tablet), logMAR |
0.04 (0.12) | 0.08 (0.13) | −0.04 (0.08)c | −0.21, 0.12 | 0.78 |
| Contrast sensitivity (Pelli Robson vs tablet), log units |
1.58 (0.17) | 1.69 (0.18) | −0.11 (0.13)d | −0.36, 0.14 | 0.75 |
| Near acuity (MNRead vs. tablet), logMAR |
0.07 (0.16) | 0.16 (0.13) | −0.09 (0.12)e | −0.34, 0.14 | 0.67 |
a
Standard test – tablet test
b
Pearson’s Correlation
c
Corresponds to a mean difference of 2 letters on the ETDRS Chart.
d
Corresponds to a mean difference of less than 1 set of triplets on the Pelli-Robson chart.
e
Corresponds to a mean difference of less than 1 sentence on the MnRead chart.
Abbreviations: LOA=limits of agreement, ETDRS= Early Treatment Diabetic Retinopathy Study, logMAR= Logarithm of the Minimum Angle of Resolution