Corneal Sequestrum in Cats
 
Corneal sequestrum occurs when the cat has dead corneal tissue (or dark spots in the cornea). It usually is caused by chronic corneal ulceration, trauma, or corneal exposure. Corneal sequestrum can affect all breeds, but is more prone in Persian and Himalayan breeds. In cats, it usually begins during their middle-aged years.
 
Symptoms and Types
 
The dark spots in your cat's cornea may remain unchanged for long periods of time, and then suddenly get worse. Listed below are some other symptoms your cat may experience:
 

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