title: Thumb rule of visual angle: a new confirmation.
abstract: The classical thumb rule of visual angle was reexamined. Hence, the visual angle was measured as a function of a thumb's width and the distance between eye and thumb. The measurement of a thumb's width when held at arm's length was taken on 67 second-year students of psychology. The visual angle was about 2 degrees as R. P. O'Shea confirmed in 1991. Also, we confirmed a linear relationship between the size of a thumb's width at arm's length and the visual angle.
authors.affiliation: Laboratori de Psicologia Experimental, Universitat Ramon Llull, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Groot
authors.forename: F
authors.initials: F
authors.lastname: Ortega
authors.forename: F S
authors.initials: FS
authors.lastname: Beltran
mesh_terms: D000328:Adult; D001288:Attention; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D009949:Orientation; D013028:Space Perception; D013933:Thumb; D014796:Visual Perception