title: Models for the description of angioscotomas.
abstract: To describe small scotomas in visual field examinations several statistical models are proposed and applied to the evaluation of angioscotoma in 13 ophthalmologically normal subjects. A special perimetric grid is used where thresholds can be estimated along a line of narrow-spaced test points which crosses the predicted location of the retinal vessel. A two-stage analysis employs single estimations to fit a threshold curve by means of a special parametric description of the luminance difference sensitivity threshold as a function of stimulus position. An alternative model incorporates the threshold as a function of position into the probabilistic description of the binary response (stimulus seen/not seen).
authors.affiliation: University Eye Hospital, Department II, Tübingen, Germany. benda@uni-tubingen.de
authors.forename: N
authors.initials: N
authors.lastname: Benda
authors.forename: T
authors.initials: T
authors.lastname: Dietrich
authors.forename: U
authors.initials: U
authors.lastname: Schiefer
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008027:Light; D008297:Male; D008433:Mathematics; D008954:Models, Biological; D011594:Psychometrics; D012171:Retinal Vessels; D012607:Scotoma / Q000175:diagnosis*; D012684:Sensory Thresholds / Q000502:physiology; D058609:Visual Field Tests