Before revision: The DMEK technique involves the removal of a very thin sheet of tissue from the posterior side of a patient 's cornea, replacing it with the two innermost layers of corneal tissue from a donor's eyeball.
After revision: The DMEK technique involves the removal of a very thin sheet of tissue from the posterior side of a person 's cornea, replacing it with the two innermost layers of corneal tissue from a donor's eyeball.