title: Machining donor material for keratoplasty.
mesh_terms: D003315:Cornea / Q000601:surgery; D016039:Corneal Transplantation; D004367:Dry Ice; D005615:Freezing; D005990:Glycerol; D008722:Methods; D019736:Prostheses and Implants; D012828:Silicones; D014021:Tissue Preservation
chemical_list: D004367:Dry Ice; D012828:Silicones; D005990:Glycerol