title: The effect of regression towards the mean on visual disability rating scales.
abstract: The effects of regression towards the mean on visual disability rating scales are analyzed. Some current strategies underestimate true visual disability by approximately 20% because they selectively retest missed points. This error does not occur if single pass or global retesting is utilized. Global retesting is a cost effective method of minimizing this problem and decreasing test variance.
authors.affiliation: University of Kentucky, Department of Ophthalmology, Veterans Administration Hospital, Lexington.
authors.forename: T J
authors.initials: TJ
authors.lastname: Smith
mesh_terms: D000368:Aged; D001766:Blindness / Q000175:diagnosis*; D005902:Glaucoma, Open-Angle / Q000150:complications*; D006801:Humans; D008875:Middle Aged; D014787:Vision Tests; D058609:Visual Field Tests; D014794:Visual Fields