Astigmatic error and axis at different ages in the study group
| Age (number of eyes) | Astigmatism (D) mean (SD) (range) | Number of eyes (%) | |||
|---|---|---|---|---|---|
| Nil | With the rule | Against the rule | Oblique | ||
| ⩽2.9 years (17) | −0.53 (0.46) (0.00–1.75) | 3 (17.6%) | 6 (35.3%) | 3 (17.6%) | 5 (29.4%) |
| 3 to 3.9 (126) | −0.64 (0.48) (0.00–2.50) | 15 (11.9%) | 56 (44.4%) | 12 (9.5%) | 43 (34.1%) |
| 4 to 4.9 (165) | −0.68 (0.55) (0.00–3.00) | 20 (12.1%) | 79 (47.9%) | 10 (6.1%) | 56 (33.9%) |
| 5 to 5.9 (172) | −0.64 (0.69) (0.00–4.75) | 33 (19.2%) | 75 (43.6%) | 7 (4.1%) | 57 (33.1%) |
| ⩾6.0 (42) | −0.70 (0.51) (0.00–2.00) | 6 (14.3%) | 20 (47.6%) | 3 (7.1%) | 13 (31.0%) |