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| Group | Participants (n) | M (eyes) | F (eyes) | Age (a, x±s) |
| Tibetan | 78 (156) | 38 (76) | 40 (80) | 52.77±10.90 |
| Yi Ethnic | 70 (140) | 36 (72) | 34 (68) | 54.00±11.77 |
| Han Nationality | 74 (148) | 38 (76) | 36 (72) | 53.46±10.93 |
| Total | 222 (444) | 112 (224) | 110 (220) |
