Research Article
The Prevalence and Causes of Visual Impairment in Type 2 Diabetes Mellitus in Northeast China
Table 3
Causes of blindness and low vision according to presenting visual acuity.
| | Causes | Better-seeing eye (WHO standard) | Better-seeing eye (US standard) | | Blindness | Low vision＃ | Blindness | Low vision | | No. (%) | No. (%) | No. (%) | No. (%) |
| | Undercorrected refractive error | 7 (38.9) | 162 (75.0) | 74 (77.1) | 273 (68.1) | | Diabetic retinopathy | 5 (27.8) | 16 (7.4) | 9 (9.4) | 31 (7.7) | | Proliferative diabetic retinopathy | 5 (27.8) | 7 (3.2) | 8 (8.3) | 6 (1.5) | | Diabetic maculopathy | 0 (0.0) | 9 (4.2) | 1 (1.0) | 25 (6.2) | | Cataract | 4 (22.2) | 24 (11.1) | 7 (7.3) | 65 (16.2) | | Myopic maculopathy | 2 (11.1) | 10 (4.6) | 5 (5.2) | 18 (4.5) | | Glaucoma | 0 (0.0) | 1 (0.5) | 0 (0.0) | 1 (0.2) | | Age-related macular degeneration | 0 (0.0) | 1 (0.5) | 0 (0.0) | 3 (0.7) | | Amblyopia | 0 (0.0) | 1 (0.5) | 1 (1.0) | 0 (0.0) | | Myopic degeneration | 0 (0.0) | 0 (0.0) | 0 (0.0) | 2 (0.5) | | Others | 0 (0.0) | 0 (0.0) | 0 (0.0) | 2 (0.5) | | Uncertain | 0 (0.0) | 1 (0.5) | 0 (0.0) | 6 (1.5) | | Total | 18 (100) | 216 (100) | 96 (100) | 401 (100) |
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Visual acuity <20/400. ＃Visual acuity <20/60 and ≥20/400. |
