[header] How to diagnose keratitis in cats [title] Take your cat to the vet. [step] If you suspect that your cat has keratitis, take him to the vet immediately. Leaving keratitis untreated can lead to severe eye damage which may result in blindness. 
[substeps] Common symptoms of keratitis include swollen or irritated eyes, discharge from the eye, and discoloration of the eye. Though eye irritation might be due to multiple conditions, or caused by a variety of triggers, any eye problems in your cat should be seen by a vet.