Ocular and vision defects in children born preterm or of low birth weight in Britain
| Region | 1984 Oxford cohort38 | 1978–81 Belfast cohort39 | 1990 Northern Region cohort40 |
|---|---|---|---|
| Birth weight | <1000 g | ⩽1500 g | All |
| Gestation | or ⩽28 weeks | All | <32 weeks |
| No examined | 49 | 200 | 558 |
| Age at examination (years) | 4 | 9 | 2 |
| Visual impairment (%) | Not reported | 56-150 | 26-151 |
| Cicatricial retinopathy of prematurity (%) | 4 | 3 | 3 |
| Optic atrophy or hypoplasia (%) | 6 | 3 | 1 |
| Cortical visual impairment (%) | 2 | 2 | 1 |
| Strabismus (%) | 24 | 19 | 13 |