Leading causes of blindness in other studies5 6 8 10 13
| Macular degeneration | Glaucoma | Cataract | Diabetes | |
|---|---|---|---|---|
| Bavaria 1992 | 15% | 14% | 5% | 7% |
| Turin 1967–91 | 4% | 9% | 27% | 13% |
| Avon 1989 | 49% | 15% | 2% | 6% |
| New South Wales 1986 | 38% | 13% | 16% | 2% |
| Scotland 1980 | 30% | 15% | 10% | 9% |
| Ireland 1996 | 16% | 16% | 11% | 3% |
↵This study looked at people aged 50 and older.