title: Ethics: a professional challenge revisited.
authors.affiliation: Southern California College of Optometry, Fullerton 92631-1699.
authors.forename: R L
authors.initials: RL
authors.lastname: Hopping
mesh_terms: D004995:Ethics, Professional; D006801:Humans; D009907:Optometry / Q000592:standards*; D012961:Sociology; D014481:United States