Annual incidence and relative risk of non-severe and severe keratitis in contact lens wear
| Wearing modality | Lens type | Annual incidence* | Relative risk‡ | ||
|---|---|---|---|---|---|
| Non-severe keratitis | Severe keratitis | Non-severe keratitis | Severe keratitis | ||
| *Number of cases per 10,000 wearers per year. | |||||
| †95% confidence limits. | |||||
| ‡Calculated independently for non-severe and severe keratitis, taking “daily wear hydrogel” as the referent in each case. | |||||
| §Indeterminable because of an annual incidence of zero. | |||||
| Daily wear | Rigid | 5.7 (2.2 to 14.7)† | 2.9 (0.8 to 10.4) | 0.4 (0.2 to 1.1) | 0.5 (0.1 to 1.9) |
| Hydrogel daily disposable | 9.1 (5.5 to 15.1) | 4.9 (2.5 to 9.6) | 0.7 (0.4 to 1.2) | 0.8 (0.3 to 1.8) | |
| Hydrogel | 14.1 (10.4 to 19.0) | 6.4 (4.1 to 9.9) | 1.0 | 1.0 | |
| Silicone hydrogel | 55.9 (9.9 to 309.7) | 0.0 (0.0 to 210.1) | 4.0 (0.6 to 28.7) | § | |
| Extended wear | Rigid | 0.0 (0.0 to 1758.8) | 0.0 (0.0 to 1758.8) | § | § |
| Hydrogel | 48.2 (13.2 to 174.0) | 96.4 (37.5 to 245.2) | 3.4 (0.8 to 14.1) | 15.2 (5.2 to 44.4) | |
| Silicone hydrogel | 98.8 (60.0 to 162.5) | 19.8 (6.7 to 58.0) | 7.0 (3.9 to 12.7) | 3.1 (0.9 to 10.5) | |