| 0 |
No abnormal fibrovascular growth (L0) |
No elevation (T0) |
No directional vascular pattern (V0) |
| 1 |
Abnormal fibrovascular tissue confined to the conjunctival area (L1) |
Minimal elevation with definite confirmation of episcleral vessel in most of the elevated area (T1) |
Minimal vascularization with unidirectional pattern (V1) |
| 2 |
Abnormal fibrovascular tissue located in the limbal area (L2) |
Moderate elevation, episcleral vessel can be found in some of the elevated area (T2) |
Moderate vascularization with unidirectional and enlarged vessels (V2) |
| 3 |
Abnormal fibrovascular tissues encroach over the limbal area (> 1.0 mm from limbus) (L3) |
Marked elevation, episcleral vessel cannot be found because of the pterygial fleshiness (T3) |
Marked vascularization with unidirectional, engorged vessels (V3) |
