| Visual acuity | Right eye | Left eye | p-value | ||
| N | % | N | % | ||
| 1.0 - 0.8 | 286 | 47.1 | 286 | 47.1 | 0.99 |
| 0.7 - 0.5 | 249 | 41.5 | 249 | 41.5 | 0.99 |
| 0.4 - 0.2 | 65 | 10.8 | 65 | 10.8 | 0.99 |