title: Questionnaire-based research in ophthalmology: questioning the quality.
authors.forename: D M
authors.initials: DM
authors.lastname: Spokes
authors.forename: J C
authors.initials: JC
authors.lastname: Buchan
mesh_terms: D015982:Bias; D001699:Biometry; D006801:Humans; D009885:Ophthalmology / Q000592:standards*; D012106:Research / Q000592:standards; D011795:Surveys and Questionnaires / Q000592:standards*