Abnormal visual acuity: |
6 m | 23 (17) | 13 (8) | 5.47 | 0.02 |
0.3 m | 19 (14) | 10 (6) | 5.0 | 0.025 |
Strabismus | 13 (9.5) | 4 (2.5) | 6.89 | 0.009 |
Spectacle wear | 31 (23) | 21 (13) | 4.79 | 0.03 |
Myopia | 20 (15) | 13 (8) | 3.25 | 0.07 |
Hypermetropia | 11 (8) | 8 (5) | 1.18 | 0.27 |
Stereopsis:
|
Abnormal | 50 (36) | 24 (15) | 18.9 | 0.00001 |
Absent | 27 (20) | 9 (5.5) | 14.1 | 0.0002 |
Poor contrast sensitivity at spatial frequency:
|
1.5 CPD | 23 (17) | 8 (5) | 10.9 | 0.0009 |
3 CPD | 25 (18) | 6 (4) | 16.5 | 0.00005 |
6 CPD | 44 (32) | 19 (12) | 18.1 | 0.00002 |
12 CPD | 51 (37) | 20 (12.5) | 24.8 | <0.00000 |
18 CPD | 62 (45) | 25 (16) | 31.3 | <0.00000 |
Any | 66 (48) | 31 (19) | 27.8 | <0.00000 |