Identified pre-existing local risk factors
| Risk factor | No | % |
|---|---|---|
| *Two patients had active HZO, the remaining eight had a previous history of HZO. | ||
| †Including trachoma, corneal calcification, phthisis bulbi, scleritis, and peripheral ulcerative keratitis. | ||
| Previous ocular surgery | 88 | 46.3 |
| Cataract surgery | 66 | 34.7 |
| Pseudophakia | 62 | 32.6 |
| Glaucoma | 48 | 25.3 |
| Reduced corneal sensation | 38 | 20.0 |
| Herpes simplex keratitis | 33 | 17.4 |
| Corneal graft | 21 | 11.1 |
| Bullous keratopathy | 17 | 8.9 |
| Dry eye | 15 | 7.9 |
| Trichiasis | 12 | 6.3 |
| Aphakia | 11 | 5.8 |
| Herpes zoster ophthalmicus* | 10 | 5.3 |
| Rubeosis iridis | 8 | 4.2 |
| Trauma | 7 | 3.7 |
| Exposure | 6 | 3.2 |
| Corneal scarring | 6 | 3.2 |
| Topical steroid use | 4 | 2.1 |
| Failed corneal graft | 4 | 2.1 |
| Uveitis | 4 | 2.1 |
| Recurrent erosion | 3 | 1.6 |
| Loose suture/suture related | 3 | 1.6 |
| Entropion | 3 | 1.6 |
| Cicatrising conjunctivitis | 3 | 1.6 |
| Contact lens | 2 | 1.1 |
| Foreign body | 1 | 0.5 |
| Other† | 5 | 2.6 |
| Any | 178 | 93.7 |
| More than 1 risk factor | 42 | 22.1 |