A black area develops in the cornea of some cats. This is painful and although these lesions may occasionally fall off, they can also lead to perforation and loss of the eye if not treated. The best treatment is surgical excision of the black area of cornea. The cornea is thin so a graft of either cornea, conjunctiva or sometimes A-cell graft may be sutured in the defect. When this heals, the eye is comfortable and often has good vision after a few months depending on the type of graft and severity of the sequestrum.