Eye banks and the availability of corneas.
D000293:Adolescent; D000328:Adult; D002648:Child; D016039:Corneal Transplantation; D003906:Developing Countries; D005069:Evaluation Studies as Topic; D006801:Humans; D007391:International Cooperation; D008875:Middle Aged; D014015:Tissue Banks; D014019:Tissue Donors; D014021:Tissue Preservation; D014184:Transplantation, Homologous; D014481:United States