Table 2.

Dua et al. classification of ocular surface chemical burns

Grade	Prognosis	Clinical findings	Conjunctival involvement	Analogue scale
I	Very good	0 clock hours of limbal involvement	0%	0/0%
II	Good	⩽ 3 clock hours of limbal involvement	⩽30%	0.1–3/1–29.9%
III	Good	> 3–6 clock hours of limbal involvement	>30–50%	3.1–6/31–50%
IV	Good to guarded	> 6–9 clock hours of limbal involvement	>50–75%	6.1–9/51–75%
V	Guarded to poor	> 9– < 12 clock hours of limbal involvement	>75– < 100%	9.1–11.9/75.1–99.9%
VI	Very poor	Total limbus (12 clock hours) involved	Total conjunctiva (100%) involved	12/100%