Table 1. Grading criteria of clinical scores.

Criteria	0	1	2	3	4
conjunctival edema	none	focal edema	edema confined within one quadrant	edema extending to 3 quadrants	massive edema.
lid edema	none	slightly narrowed palpebral fissure (3/4 normal width) with congestionsevere edema (1/3 of normal width)	narrowed palpebral fissure with edema (2/3 of normal width)	narrowed fissure with severe edema (1/3 of normal width)	massive edema (cornea barely visible).
tear/discharge	minimal level of tear meniscus	increased tear level with concave meniscus	increased tear level with convex meniscus	highly increased tear level with mucous secretion	excessive tearing with copious discharge
conjunctival redness	none	barely detectable venous dilatation	three or four dilated vessels at corneal limbus	five or six dilated vessels at limbus	marked ciliary injection

The clinical responses were graded at 20 min after allergen challenge.