Have Cat Questions? Ask a Cat Vet Online.
Hi, Welcome to JustAnswer. I'm Dr. Barbara, a licensed veterinarian with over 30 years experience, and I'd like to help you today.
Many different problems can lead to a blood shot eye, but I am concerned more with the fact that you think he can't see from the eye. Elevated blood pressure will frequently cause sudden blindness in one or both eyes from retinal detachment. This can often be reversed if treated right away.
However, the suddenness of his red eye and the fact that your kitty won't eat makes me wonder if he wasn't in a fight and perhaps now has a scratch on his cornea (which is usually not visible without a special stain your vet will have).
Has your cat been fine in every way until now?
Thanks for your response!
Most likely this is an injury to the blood shot eye. When the pupil is constricted that means there is also an anterior uveitis. In other words there is inflammation/infection in the eye.
But he would still be able to see from the affected eye.
There is the possibility that his blood pressure is elevated also. The most common cause of this in cats is hyperthyroidism or kidney disease. How old is your cat?
Your vet will have equipment to measure his blood pressure. Human sphygmomanometers aren't useful for cats (this is a blood pressure cuff).
Thanks. Hyperthyroidism is very unusual in such a young cat, and kidney disease would have caused other symptoms that you would have noticed over the past weeks to months, so this is very likely an acute injury he has sustained.
It sounds very likely that this injury is deep in the eye (constricted pupil, loss of vision, cloudy cornea/anterior chamber of the eye). I do recommend that he see a veterinarian there now to have the best chance of restoring his vision and, at the very least, save his eye.
Both acetaminophen and ibuprofen are toxic to cats, but aspirin can be used if dosed correctly. The dose is 10mg/kg every 2-3 days.
You're welcome! After chatting, I really do think he is sore from a fight during which he sustained a scratch or puncture to the eye. He should be seen right away tomorrow morning by your vet to have antibiotics, pain reliever, and eye medication begun. It is also very important to keep him from rubbing the eye. Hopefully tonight he will just sleep.
Let your vet's receptionist know that he is somewhat of an emergency since his eye is severely injured.
Best of luck to you both!