Feline corneal sequestration is a painful corneal disease due to the development of an opaque, dark brown to black plaque on the cornea which is a dead piece of corneal tissue. The sequestra penetrates into the corneal tissue and it can be removed surgically (Keratectomy) with the use of an operating microscope.A conjuctival flap is used to cover the surgical site for a few weeks to strengthen the cornea in that area and hasten healing.