Visual improvement after correcting refractive errors*
| Gained lines | % (95% CI) | ||
|---|---|---|---|
| *Standardised for age and sex based on the 1996 national census. | |||
| Presenting vision worse than 20/40 in the better eye (n = 349) | ⩾1 line | 81.9 (77.7 to 86.1) | |
| ⩾2 lines | 76.1 (71.6 to 80.1) | ||
| ⩾3 lines | 71.1 (66.4 to 75.7) | ||
| ⩾4 lines | 62.0 (57.1 to 66.8) | ||
| Presenting vision worse than 20/20 in the better eye (n = 1163) | ⩾1 line | 85.8 (83.7 to 87.9) | |
| ⩾2 lines | 58.9 (55.8 to 61.9) | ||
| ⩾3 lines | 38.4 (35.2 to 41.7) | ||
| ⩾4 lines | 23.7 (21.0 to 26.3) | ||
| Total (n = 4317) | ⩾1 line | 26.7 (25.1 to 28.3) | |
| ⩾2 lines | 16.5 (15.1 to 17.8) | ||
| ⩾3 lines | 10.1 (9.1 to 11.2) | ||
| ⩾4 lines | 5.9 (5.2 to 6.7) | ||