Cat's eyes look bad

My 12 year old female cat left eye looked the the pupil had grown oblong toward her nose. The next day both pupils were the correct shape but completey dialated. The next day perfectly fine. Now a week later her right eye is completely black no green at all & the other eye is fine. She's eating, drinking, using the litter box, same energy. Any thoughts? Thanks

Bring the cat to a vet.

That sounds really severe and serious! Have you brought the cat to your veterinarian?

Please update on how your cat is doing....

Thanks!