title: Sources of bias in studies of optic disc and retinal nerve fibre layer morphology.
authors.affiliation: Glaucoma Unit, Moorfields Eye Hospital, London.
authors.forename: D F
authors.initials: DF
authors.lastname: Garway-Heath
authors.forename: R A
authors.initials: RA
authors.lastname: Hitchings
mesh_terms: D005901:Glaucoma / Q000473:pathology*; D006801:Humans; D009412:Nerve Fibers / Q000473:pathology*; D009898:Optic Disk / Q000473:pathology; D012160:Retina / Q000473:pathology*; D015983:Selection Bias