Table 1.
Mean and lower limit for visual acuity and interocular difference by age group
| Visual acuity |
Interocular difference |
||||||
|---|---|---|---|---|---|---|---|
| Age group, years | No. of participantsa | Mean logMAR | Mean Snellen | 95% lower limit, logMAR | 95% lower limit, Snellen | Mean | 95% upper limit IOD |
| 7 | 58 | −0.02 | 20/20 | 0.12 | 20/25 | 0.04 | 0.13 |
| 8 | 45 | −0.06 | 20/16 | 0.06 | 20/25 | 0.04 | 0.13 |
| 9 | 35 | −0.06 | 20/16 | 0.05 | 20/25 | 0.04 | 0.13 |
| 10 | 37 | −0.06 | 20/16 | 0.07 | 20/25 | 0.05 | 0.13 |
| 11 | 30 | −0.06 | 20/16 | 0.06 | 20/25 | 0.06 | 0.16 |
| 12 | 30 | −0.07 | 20/16 | 0.07 | 20/25 | 0.05 | 0.13 |
| Adults | 38 | −0.08 | 20/16 | 0.06 | 20/25 | 0.04 | 0.12 |
LogMAR, logarithm of the minimum angle of resolution.
a
Each participant contributed data from two eyes; statistical analysis considered the correlation between the visual acuities of the two eyes of individuals.