Visual acuity of the better eye
| ROP | <0.1 | 0.1–0.29 | 0.3–0.49 | 0.5–0.69 | ⩾0.7 | Total |
|---|---|---|---|---|---|---|
| (A) Relation to stage of ROP | ||||||
| No | 0 (0%) | 1 (0.7%) | 1 (0.7%) | 50 (35%) | 91 (63.6%) | 143 (100%) |
| Mild | 0 (0%) | 1 (2.2%) | 2 (4.3%) | 23 (50%) | 20 (43.5%) | 46 (100%) |
| Severe without cryo | 1 (4.2%) | 1 (4.2%) | 2 (8.3%) | 9 (37.5%) | 11 (45.8%) | 24 (100%) |
| Severe with cryo | 1 (4.2%) | 1 (4.2%) | 2 (8.3%) | 16 (66.7%) | 4 (16.6%) | 24 (100%) |
| Total | 2 (0.8%) | 4 (1.7%) | 7 (2.9%) | 98 (41.4%) | 126 (53.2%) | 237 (100%) |
| (B) Relation to gestational age at birth (weeks) | ||||||
| 24–26 | 1 (3.3%) | 0 (0%) | 2 (6.7%) | 15 (50%) | 12 (40%) | 30 (100%) |
| 27–29 | 1 (0.9%) | 3 (2.7%) | 4 (3.6%) | 49 (43.7%) | 55 (49.1%) | 112 (100%) |
| 30–32 | 0 (0%) | 1 (1.3%) | 1 (1.3%) | 28 (36.9%) | 46 (60.5%) | 76 (100%) |
| 33–35 | 0 (0%) | 0 (0%) | 0 (0%) | 6 (31.6%) | 13 (68.4%) | 19 (100%) |
| Total | 2 (0.8%) | 4 (1.7%) | 7 (2.9%) | 98 (41.4%) | 126 (53.2%) | 237 (100%) |
| (C) Relation to birth weight (g) | ||||||
| ⩽750 | 1 (10%) | 0 (0%) | 1 (10%) | 6 (60%) | 2 (20%) | 10 (100%) |
| 751–1000 | 0 (0%) | 1 (1.9%) | 1 (1.9%) | 21 (38.8%) | 31 (57.4%) | 54 (100%) |
| >1000 | 1 (0.6%) | 3 (1.7%) | 5 (2.9%) | 71 (41%) | 93 (53.8%) | 173 (100%) |
| Total | 2 (0.8%) | 4 (1.7%) | 7 (2.9%) | 98 (41.4%) | 126 (53.2%) | 237 (100%) |