Percentage distribution of principal causes of impaired/blind eyes by presenting visual acuity and age
| Presenting visual acuity | Subject age (years) | ||||||
|---|---|---|---|---|---|---|---|
| Principal cause | ≥6/60–<6/18 | ≥3/60–<6/60 | <3/60 | 60–69 | 70–79 | ≥80 | All (%) |
| Refractive error | 61.6 | 10.0 | 2.9 | 63.4 | 52.4 | 32.0 | 51.0 |
| Cataract | 25.1 | 51.6 | 36.2 | 16.5 | 28.1 | 43.6 | 28.1 |
| Macular degeneration | 5.0 | 14.7 | 20.7 | 6.3 | 6.1 | 12.0 | 7.6 |
| Glaucoma | 2.2 | 4.6 | 7.5 | 2.8 | 3.5 | 2.4 | 3.0 |
| Corneal opacity | 1.6 | 5.3 | 5.9 | 3.6 | 1.8 | 1.6 | 2.4 |
| Retinal abnormalities | 1.6 | 2.8 | 7.5 | 2.8 | 2.6 | 1.7 | 2.4 |
| High myopia | 0.8 | 3.7 | 5.4 | 1.5 | 1.6 | 1.5 | 1.6 |
| Others | 0.3 | 1.9 | 4.2 | 1.0 | 0.8 | 0.9 | 0.9 |
| Globe (absent/phthisical) | – | – | 6.6 | 0.4 | 1.0 | 1.1 | 0.8 |
| Optic atrophy | 0.4 | 2.5 | 2.7 | 0.4 | 0.8 | 1.3 | 0.8 |
| PCO/after cataract | 0.8 | 0.9 | 0.4 | 0.8 | 0.6 | 1.0 | 0.7 |
| Undetermined | 0.6 | 2.1 | – | 0.4 | 0.7 | 0.9 | 0.7 |
| All | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |