Table 3 Causes of monocular visual impairment and blindness based on BCVA and presenting visual acuity using the WHO criteria.
Causes | Number (%) of eyes | |||||
|---|---|---|---|---|---|---|
Based on BCVA | Based on presenting visual acuity | |||||
VI | Blindness | Combined | VI | Blindness | Combined | |
Uncorrected refractive error (including aphakia) | – | – | – | 6156 (90.53%) | 100 (29.07%) | 6256 (87.57%) |
Cataract | 80 (15.07%) | 30 (15.38%) | 110 (15.15%) | 75 (1.10%) | 40 (11.63%) | 115 (1.61%) |
Amblyopia | 30 (5.65%) | 30 (15.38%) | 60 (8.26%) | 32 (0.47%) | 31 (9.01%) | 63 (0.88%) |
Glaucoma | 18 (3.39%) | 6 (3.08%) | 24 (3.31%) | 19 (0.28%) | 8 (2.33%) | 27 (0.38%) |
Diabetic retinopathy | 4 (0.75%) | 10 (5.13%) | 14 (1.93%) | 5 (0.07%) | 10 (2.91%) | 15 (0.21%) |
Ocular trauma | 24 (4.52%) | 15 (7.69%) | 39 (5.37%) | 22 (0.32%) | 20 (5.81%) | 42 (0.59%) |
Age-related macular degeneration | 7 (1.32%) | 4 (2.05%) | 11 (1.52%) | 8 (0.12%) | 4 (1.16%) | 12 (0.17%) |
Optic neuropathy | 10 (1.88%) | 4 (2.05%) | 14 (1.93%) | 11 (0.16%) | 5 (1.45%) | 16 (0.22%) |
Corneal opacity | 4 (0.75%) | 2 (1.03%) | 6 (0.83%) | 4 (0.06%) | 2 (0.58%) | 6 (0.08%) |
Uveitis | 0 (0.00%) | 4 (2.05%) | 4 (0.55%) | 0 (0.00%) | 4 (1.16%) | 4 (0.06%) |
Myopic retinopathy | 11 (2.07%) | 3 (1.54%) | 14 (1.93%) | 10 (0.15%) | 4 (1.16%) | 14 (0.20%) |
Other | 343 (64.60%) | 87 (44.62%) | 430 (59.23%) | 458 (6.74%) | 116 (33.72%) | 588 (8.03%) |
Total eyes | 531 (100%) | 195 (100%) | 726 (100%) | 6800 (100%) | 344 (100%) | 7144 (100%) |
