| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty at all | 20288 |
98%
|
| 2 | Yes, some difficulty | 293 |
1.4%
|
| 3 | Yes, a lot of difficulty | 87 |
0.4%
|
| 4 | Cannot see at all | 34 |
0.2%
|
| 5 | Do not know | 1 |
0%
|