| Visual outcome | Pre | Post | ||
| N' | % | N | % | |
| Good | 6 | 17.1 | 29 | 82.9 |
| Bad | 29 | 82.9 | 6 | 17.1 |
| Total | 35 | 100 | 35 | 100 |
| X2 | 30.231 | |||
| P value | 0.001* | |||