Hello XXXXXXXXXXX,
This is Dr. Christian. Can you give me a little more information. Is your cat usually outdoors or indoors? How is acting otherwise (eating, drinking, activity)?
There are diseases in cats that cause a keratitis or inflammation on the surface of the eye. Some of these lesions can be quite large. Your veterinarian sounds like he or she is on the right track and actually diagnosing the cause of the problem sometimes requires surgery and biopsy. Sometimes surgery is required to remove the lesion. Causes can be trauma, chronic viral infections such as herpes virus and bacterial infections. Give the medications some time to work and then an ophthalmologist is a very good option if they don't. If you have more questions let me know.
Sincerely,
Dr. Christian
do you think he's in pain?
Cat Veterinarian
12 year of veterinary experience in feline surgery, medicine and behavior