Very slight erythema (barely 1 Very slight oedema (barely 1 perceptible) perceptible) Well-defined erythema 2 Slight oedema (edges of area 2 by definite raising Moderate to severe erythema 3 Moderate oedema (raised approx. 1 3 mm) Severe erythema (beet redness) 4 Severe oedema (raised more than 1 4 mm and extending beyond area of exposure) The Draize scale for evaluation of eye reactions is as follows: CORNEA Opacity Rating Area of Cornea involved Rating No opacity 0 none 25% or less (not zero) 1 Diffuse area, details of iris clearly 1 slight 25% to 50% 2 visible Easily visible translucent areas, 2 mild 50% to 75% 3 details of iris slightly obscure Opalescent areas, no details of iris 3 Greater than 75% 4 visible, size of pupil barely moderate discernible Opaque, iris invisible 4 severe CONJUNCTIVAE Redness Rating Chemosis Rating Discharge Rating Vessels normal 0 none No swelling 0 none No discharge 0 none Vessels definitely 1 Any swelling above 1 slight Any amount different 1 slight injected above normal slight normal from normal 2 mild More diffuse, deeper 2 mod. Obvious swelling Discharge with 2 mod. 3 mod. crimson red with with partial eversion moistening of lids and 3 3 individual vessels not of lids adjacent hairs 4 severe severe easily discernible severe Swelling with lids Discharge with Diffuse beefy red half-closed moistening of lids and hairs and Swelling with lids considerable area half-closed to around eye completely closed IRIS Values Rating Normal 0 none above normal, congestion, swelling, circumcorneal injection, iris reacts to light 1 slight
Very slight erythema (barely perceptible) 1 Very slight oedema (barely perceptible) 1 Well-defined erythema 2 Slight oedema (edges of area by definite raising 2 Moderate to severe erythema 3 Moderate oedema (raised approx. 1 mm) 3 Severe erythema (beet redness) 4 Severe oedema (raised more than 1 mm and extending beyond area of exposure) 4 The Draize scale for evaluation of eye reactions is as follows: CORNEA Opacity Rating Area of Cornea involved Rating No opacity 0 none 25% or less (not zero) 1 Diffuse area, details of iris clearly visible 1 slight 25% to 50% 2 Easily visible translucent areas, details of iris slightly obscure 2 mild 50% to 75% 3 Opalescent areas, no details of iris visible, size of pupil barely discernible 3 moderate Greater than 75% 4 Opaque, iris invisible 4 severe CONJUNCTIVAE Redness Rating Chemosis Rating Discharge Rating Vessels normal Vessels definitely injected above normal More diffuse, deeper crimson red with individual vessels not easily discernible Diffuse beefy red 0 none 1 slight 2 mod. 3 severe No swelling Any swelling above normal Obvious swelling with partial eversion of lids Swelling with lids half-closed Swelling with lids half-closed to completely closed 0 none 1 slight 2 mild 3 mod. 4 severe No discharge Any amount different from normal Discharge with moistening of lids and adjacent hairs Discharge with moistening of lids and hairs and considerable area around eye 0 none 1 slight 2 mod. 3 severe IRIS Values Rating Normal 0 none above normal, congestion, swelling, circumcorneal injection, iris reacts to light 1 slight