- the cat has suffered a trauma to the eye
- the cat has an eye infection
- the cat has parasites
I suggest that you see the vet for a fecal exam to rule out parasites. If this is negative, your cat may need antibiotics to treat any eye infections that are present.
The vet might also want to stain the eye to look for a corneal scratch that might be the culprit.
Until you can see the vet, you can flush the eyes with warm saline and dry them well with a clean, dry towel. If this does not resolve, your pet probably needs an antibiotic.
Let me know if you still have questions.
