[Twenty years of our penetrating keratoplasty].
D016039:Corneal Transplantation; D005260:Female; D049673:History, 20th Century; D006801:Humans; D007564:Japan; D008297:Male; D008722:Methods; D014015:Tissue Banks / Q000266:history; D014021:Tissue Preservation; D014184:Transplantation, Homologous; D014792:Visual Acuity