The S-Stamp Eliminates the Primary Cause of Graft Failure in DMEK January 26, 2016 Peter Veldman, MD, of Mass. Eye and Ear was first author on two recent publications related to the S-stamp for Descemet membrane endothelial keratoplasty (DMEK), a novel orientation technique that has... Read More The S-Stamp Eliminates the Primary Cause of Graft Failure in DMEK