title: A preliminary comparative study of epikeratophakia or penetrating keratoplasty for keratoconus.
mesh_terms: D003315:Cornea / Q000601:surgery*; D016039:Corneal Transplantation; D005069:Evaluation Studies as Topic; D005500:Follow-Up Studies; D006084:Graft Rejection; D006801:Humans; D007640:Keratoconus / Q000534:rehabilitation / Q000601:surgery*; D011446:Prospective Studies; D011897:Random Allocation; D014792:Visual Acuity