title: Collagen shrinkage procedures for keratoconus and corneal astigmatism.
mesh_terms: D001251:Astigmatism / Q000209:etiology / Q000601:surgery*; D002387:Cataract Extraction / Q000009:adverse effects; D002425:Cautery; D003094:Collagen; D006801:Humans; D007640:Keratoconus / Q000601:surgery*
chemical_list: D003094:Collagen