Table 1.

A staging system for limbal stem cell deficiency based on slit-lamp signs.²⁷

Subdivisions	Stage 1: Central 5 mm spared	Stage 2: Central 5 mm affected	Stage 3: Entire cornea affected
A	Less than 50% of limbus affected	Less than 50% of limbus affected
B	50% or more of the limbus affected	50% or more of the limbus affected (but <100%)
C	100% of limbus affected