Descemet membrane endothelial keratoplasty is a method of corneal transplantation. 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 innermost layer of corneal tissue from a donor’s eyeball. The cornea graft attaches with a gas bubble underneath it that dissolves over a few days. This is the latest and most effective corneal transplant technique. Dr Mehan performed the first DMEK in Dayton Ohio in 2013.