Distribution of uncorrected, spectacle corrected, presenting, and best corrected visual acuity in each visual acuity group in terms of number, percentage and 95% confidence interval*
| Visual acuity groups | Uncorrected visual acuity | Spectacle corrected visual acuity | Presenting visual acuity | Best corrected visual acuity |
|---|---|---|---|---|
| *Standardised for age and grade level | ||||
| †The 95% confidence interval was calculated using binominal distribution | ||||
| The design effect was 0.8 to 4.4 | ||||
| 20/32 or better in both eyes | 5141 (92.7%) | 261 (76.6%) | 5238 (95.0%) | 5473 (98.5%) |
| (91.3–94.2) | (71.5–81.8) | (94.0–95.9) | (98.1–99.0) | |
| 20/32 or better in one eye | 170 (3.4%) | 48 (14.7%) | 165 (3.3%) | 57 (1.1%) |
| (2.6–4.1) | (9.9–19.4) | (2.5–4.1) | (0.8–0.15) | |
| 20/40 to 20/63 in the better eye | 124 (2.1%) | 23 (6.6%) | 74 (1.3%) | 6 (0.1%) |
| (1.6–2.7) | (4.1–9.0) | (0.9–1.7) | (0.03–0.23)† | |
| 20/80 to 20/160 in the better eye | 75 (1.2%) | 7 (2.1%) | 16 (0.3%) | 5 (0.1%) |
| (0.6–1.8) | (0.6–3.6) | (0.1–0.5) | (0.05–0.36)† | |
| 20/200 or worse in the better eye | 25 (0.5%) | – | 6 (0.1%) | 3 (0.1%) |
| (0.2–0.8) | (0.05–0.38) | (0.03–0.35)† | ||
| Total sample | 5535 | 339 | 5544 | 5544 |