Severity score | Schirmer’s test (mm) | Corneal Fluorescein Staining (points) | Ocular Surface Disease Index (points) | Conjunctival injection (points) |
0 | >15 | 0 | <13 | None |
1 | 11 - 15 | <2 | 13 - 22 | Mild/Moderate |
2 | 6 - 10 | 2 - 3 | 23 - 32 | Severe |
3 | ≤5 | ≥4 | ≥33 | Severe |