Predisposing factors for microbial keratitis in the elderly
| Predisposing factors | Number of patients(n=102) | Prevalence (%) |
| Ocular disease | 39 | 38.2 |
| glaucoma | 12 | |
| corneal oedema | 7 | |
| corneal scarring | 6 | |
| previous ulcer, same eye | 4 | |
| dry eyes | 4 | |
| corneal degeneration | 2 | |
| trichiasis | 1 | |
| xerophthalmia | 1 | |
| conjunctivitis | 1 | |
| lagophthalmos | 1 | |
| Previous ocular surgery, same eye | 30 | 29.4 |
| Trauma | 18 | 17.6 |
| plant | 5 | |
| dirt | 2 | |
| contact lens | 2 | |
| stone | 1 | |
| chemical | 1 | |
| not identified | 7 | |
| Systemic disease | 17 | 16.7 |
| diabetes mellitus | 14 | |
| rheumatoid arthritis | 1 | |
| Stevens–Johnson syndrome | 1 | |
| measles | 1 |
↵Total is greater than 102 because of multiple predisposing factors in some patients.