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 details of 2 mild 50% to 75% 3 iris slightly obscure Opalescent areas, no details of iris 3 Greater than 75% 4 visible, size of pupil barely discernible moderate 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 with Discharge with 2 mod. 3 mod. crimson red with partial eversion of lids moistening of lids and 3 severe 3 severe individual vessels not adjacent hairs 4 severe Swelling with lids easily discernible Discharge with Diffuse red moistening of lids and Swelling with lids hairs and considerable closed to completely area around eye IRIS Values Rating Normal 0 none Folds above normal, congestion, swelling, circumcorneal injection, iris reacts to light 1 slight No reaction to light, haemorrhage, gross destruction 2 severe
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 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 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 Swelling with lids 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 Folds above normal, congestion, swelling, circumcorneal injection, iris reacts to light 1 slight No reaction to light, haemorrhage, gross destruction 2 severe