Its eye is injured
Expert Answer
Hello, from the photo you uploaded, the cat is preliminarily judged to have uveitis. It is recommended to take the cat to a veterinary clinic for an ophthalmic examination and to start effective treatment promptly.
If feline uveitis is not treated in time, it can worsen and lead to necrosis of the eye. Uveitis may be spontaneous or related to a systemic disease, so the cat needs a careful examination to determine the best treatment plan.
My cat's uveitis needed the vet fast, and they were clear untreated it can rot the eye, so I'd get the ophthalmic exam immediately. I'd also check for the systemic cause behind it. Mine kept his sight because we acted, but I'd treat any eye injury as urgent, uveitis escalates quietly, the clinic visit is what saves the eye, don't gamble on drops alone.