Table 3.
Ocular disorders and uncorrected visual acuity (UCVA).
| Number (%) of children with VA ≤ 20/40 |
UCVA prevalence | |||
|---|---|---|---|---|
| One or both eyesa | Right eye | Left eye | ||
| Refractive errorb | 963 (93.9) | 863 (90.4) | 858 (88.1) | 18.6% |
| Amblyopiac | 58 (5.7) | 90 (9.4) | 112 (11.5) | 1.1% |
| Traumatic optic neuropathy | 1 (0.1) | 0 | 1 (0.1) | 0.02% |
| Keratoconus | 2 (0.3) | 1 (0.1) | 2 (0.2) | 0.04% |
| Ptosis | 1 (0.1) | 1 (0.01 | 1 (0.1) | 0.02% |
| Total | 1025 (100) | 955 | 974 | 19.8% |
UCVA: uncorrected visual acuity.
a
Children with VA 20/40 or worse in both eyes may represent two different causes of reduced vision – a different cause for each eye.
b
RE was assigned as cause of reduced vision for the eyes correcting to 20/32 or better with subjective refraction.
c
Includes only cases meeting the defined anisometropia or hyperopia criteria for amblyopia.