Table 1 Sociodemographic and clinical characteristics of the two samples
| Â | Sample 1, n = 276 | Sample 2, n = 95 |
|---|---|---|
Mean of age (range) | 66.8 (21 to 95) | 71.9 (52 to 86) |
Female (%) | 141 (51.0) | 71 (74.7) |
Visual acuity (Snellen fraction) | Â | Â |
   Better eye, mean (range) | 20/120 (20/13 to 20/2000) | 20/110 (20/16 to 20/2000) |
   Worse eye, mean (range) | 20/200 (20/13 to 20/2000) | 20/200 (20/20 to 20/2000) |
Chronic eye disease, number (%) | Â | Â |
   Age-related cataract | 96 (34.8) | 95 (100) |
   Glaucoma | 69 (25.0) | Not applicable |
   Age-related macular degeneration | 80 (29.0) | Not applicable |
   Normal reference | 31 (11.2) | Not applicable |
Medical comorbidities* | Â | Â |
   0 | 104 (37.7) | Not applicable |
   1 | 97 (35.1) | Not applicable |
   2 or more | 75 (27.2) | Not applicable |