| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty at all | 19414 |
93.8%
|
| 2 | Yes, some difficulty | 894 |
4.3%
|
| 3 | Yes, a lot of difficulty | 322 |
1.6%
|
| 4 | Cannot see at all | 72 |
0.3%
|
| 5 | Do not know | 1 |
0%
|