Grade | Clinical findings |
0 quiescent | Absence of symptoms |
1 mild | Presence of symptoms, but no corneal involvement |
2 moderate | Presence of symptoms including photophobia, but no corneal involvement |
3 severe | Presence of symptoms including photophobia, plus mild-to-moderate SPK |
4 very severe | Presence of symptoms including photophobia, plus diffuse SPK or corneal ulcer |