Table 1.

Grading of the clinical inflammatory features of alkali chemical injury on cornea [4,18].

Clinical features	Grade
	normal	mild	moderate	severe
Conjunctival hyperemia	absent	mild or sectoral engorgement of the conjunctival vessels	diffuse engorgement of the conjunctival vessels	significant engorgement of conjunctival vessels
Corneal edema	absent	present with visible iris details	present without iris details	present without visible pupil
Corneal epithelial defect	absent	defect involving less than one quarter of the corneal surface	defect involving one quarter to one half of the corneal surface	defect involving more than one half of the corneal surface