Ewwwwww

In corneal transplant, also known as keratoplasty, a patient's damaged cornea is replaced by the cornea from the eye of a human cadaver. This is the most common type of human transplant surgery and has the highest success rate...
the eye is held open with a speculum. A laser is used to make an initial cut in the existing cornea. The surgeon uses scissors to remove it, and a donor cornea is placed. It is stitched with very fine sutures.