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Descriptive Characteristics of the Study Groups
| Characteristic | Young (18–40 y) | Middle-Aged (41–60 y) | Older (>60 y) |
|---|---|---|---|
| Number | 22 | 20 | 15 |
| Age (y), mean ± SD | 24 ± 4 | 51 ± 5 | 75 ± 7 |
| Male, n (%) | 10 (45) | 12 (60) | 6 (40) |
| Refraction (D), mean ± SD | –1.52 ± 1.70 | –1.10 ± 1.83 | 0.40 ± 2.00 |
