title: Prevention of corneal ulcers.
mesh_terms: D002118:Calcium; D002986:Clinical Trials as Topic; D003315:Cornea / Q000201:enzymology*; D003320:Corneal Ulcer / Q000188:drug therapy / Q000201:enzymology / Q000517:prevention & control*; D004492:Edetic Acid / Q000627:therapeutic use*; D006801:Humans; D008722:Methods; D011142:Polyvinyl Alcohol; D013997:Time Factors
chemical_list: D011142:Polyvinyl Alcohol; D004492:Edetic Acid; D002118:Calcium