| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1 | no difficulty seeing | 53290 |
86.8%
|
| 2 | some difficulty | 6802 |
11.1%
|
| 3 | a lot of difficulty | 1129 |
1.8%
|
| 4 | cannot see at all | 119 |
0.2%
|
| 8 | don't know | 44 |
0.1%
|
| Sysmiss | 12412 |