title: Results of penetrating keratoplasty over a four-year period.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003316:Corneal Diseases / Q000601:surgery; D003318:Corneal Opacity / Q000209:etiology; D016039:Corneal Transplantation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011379:Prognosis; D014019:Tissue Donors; D014184:Transplantation, Homologous; D014792:Visual Acuity