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Grading system for in vivo tolerance evaluation signs.
| Grade | Discomfort | Cornea | Conjunctiva | Discharge | Lids |
|---|---|---|---|---|---|
| 0 | No reaction | No alterations | No alterations | No discharge | No swelling |
| 1 | Blinking | Mild Opacity | Mild hyperemia/mild oedema | Mild discharge without moistened hair | Mild swelling |
| 2 | Enhanced blinking/intense tearing/vocalizations | Intense opacity | Intense hyperemia/intense oedema/haemorrhage | Intense discharge with moistened hair | Obvious swelling |
