Specific activities of the proteases present in tear samples from healthy individuals and patients with anterior ocular eye disease
| Diagnostic group | Sample reference | Protease specific activity (μmol/min/mg) |
| Group 1 (normal) | Not given | 1.7 (0.7) (n=11) |
| Group 2a (keratoconus) | 1, 2, 3, 6, 7 | 1.4 (0.5) (n=5) |
| Group 2b (keratoconus) | 8, 9, 10, 12, 13, 14 | 3.9 (1.1) (n=6) |
| Group 3 | ||
| Bacterial keratitis | 19, 20 | 8.3 (3.1) (n=2) |
| Rosacea keratitis | 21, 22 | 9.5 (1.9) (n=2) |
| Thygeson's keratitis | 21 | 3.2 (n=1) |
| Acanthamoeba keratitis | 24, 25 | 6.6 (0.7) (n=2) |
| Summated | 7.4 (2.8) (n=7) | |
| Group 4 (herpes) | 18 | 5.4 (n=1) |
| Group 5 (dry eye) | 30 | 6.0 (n=1) |