Table 1.

A new staging system for limbal stem cell deficiency based on slit-lamp findings

Subdivision	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 limbus affected	50% or more of limbus affected (but < 100%)
C	100% of limbus affected

This system was developed by an international working group [11]. Stages 1 and 2 have further subdivisions based on the proportion of limbus affected