| Value | Category | Cases | |
|---|---|---|---|
| 1 | no difficulty seeing | 9385 |
72.5%
|
| 2 | some difficulty | 2691 |
20.8%
|
| 3 | a lot of difficulty | 857 |
6.6%
|
| 4 | cannot see at all | 16 |
0.1%
|
| 8 | don't know | 0 |
0%
|