Table 1.
Sociodemographic and clinical characteristics of the two samples
| 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) | ||
| 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 (%) | ||
| 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* | ||
| 0 | 104 (37.7) | Not applicable |
| 1 | 97 (35.1) | Not applicable |
| 2 or more | 75 (27.2) | Not applicable |