title: Direct suturing in penetrating keratoplasty.
mesh_terms: D001251:Astigmatism; D003315:Cornea / Q000601:surgery; D016039:Corneal Transplantation; D006801:Humans; D008853:Microscopy / Q000295:instrumentation; D008866:Microsurgery; D013514:Surgical Procedures, Operative; D013536:Suture Techniques; D014184:Transplantation, Homologous; D014207:Trephining