| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty at all | 19588 |
94.6%
|
| 2 | Yes, some difficulty | 901 |
4.4%
|
| 3 | Yes, a lot of difficulty | 195 |
0.9%
|
| 4 | Cannot see at all | 18 |
0.1%
|
| 5 | Do not know | 1 |
0%
|