| Usable gestures for blind people: understanding preference and performance Recent countries visiting this post |  |
 | 7 | United States |
 | 3 | |
 | 1 | China |
 | 1 | Sweden |
| Usable gestures for blind people: understanding preference and performance Recent countries visiting this post | |
| 7 | United States |
| 3 | |
| 1 | China |
| 1 | Sweden |