Hi, a change in eye color could be caused by tumors or other eye conditions, too.
It's best to get kitty checked out by the vet and don't wait, especially if this might be caused by a tumor. I'm not trying to scare you, but I personally dealt w/ a cat that had ocular melanoma w/ a change in eye color in one eye. IF I had known, I would've taken my cat in sooner.
Good luck!
This kitty needs to see a Doctor asap.....same thing happened with my kitty a few years ago, don't let the Vets fool around with eye drops for weeks on end either, insist on a blood pressure measurement. this would have saved my boys eye if this had been done earlier.
also have tests done for Chronic Renal Failure (CRF). this can be the cause of the high blood pressure.
Hyperthyroid test too.
please don't waste anytime getting kitty in, this is very important, do not wait until after the holidays...
best of luck and post back with an update please.....♥