Today I took my cat (his name is Georgy) to a vet for a surgery. He developed the corneal sequestrum, a kind of an ulcer, on the right eye. This condition seems to be quite common among the Persian, and the cause can't really be determined. It might be the result of some kind of eye irritation, feline herpesvirus, lack of tear production (some cats even sleep with their eyes open, causing the eye to dry) or corneal ulceration.
Although the sequestrum was already very deep, the operation didn't last too long and right now, Georgy is already awake from his anesthetic sleep.
We're having our next visit to the vet's scheduled for the next Monday, when the surgeon is going to remove the stitches. Hopefully, the surgery is going to be a success.