Scoring of clinical conjunctival changes
| Score | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| *Localised in temporal area of upper lid. | ||||
| Conjunctival swelling* | Mild | Moderate with diffuse margin | Moderate with discrete margin | Severe with overhanging edge |
| Pigmentation over swelling | Loss of some pigment | Loss of some pigment | Depigmented | Depigmented |
| Hyperaemia | None | Generalised | Localised petechiae | Localised patchy, haemorrhagic appearance |