Table II.

Evaluation score for the corneal chemical injury.

Score	0	1	2	3	4
Corneal opacity	No opacity, transparent cornea	Slight opacity, visible pupil and iris texture	Moderate opacity, iris texture is unclear, but pupillary margin is visible	Severe opacity, pupillary margin is visible vaguely	Very severe opacity, nothing can be visualized under cornea
Epithelial defect	No defect	≤1/4 of the corneal surface	1/4–1/2 of the corneal surface	1/2–3/4 of the corneal surface	≥3/4 of the corneal surface
Neovascularization	No vessel	2 mm within limbus	≤1/2 of the corneal surface	≥1/2 of the corneal surface	Total surface of the corneal surface