| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty at all | 19960 |
96.4%
|
| 2 | Yes, some difficulty | 610 |
2.9%
|
| 3 | Yes, a lot of difficulty | 125 |
0.6%
|
| 4 | Cannot see at all | 8 |
0%
|