title: Detection of functional vision loss using the Ishihara plates.
abstract: Many techniques have been described for the detection of functional visual loss. We report four cases in which Ishihara pseudo-isochromatic colour plates gave objective evidence of functional vision loss. In all cases the patients were able to read the first test pattern (No. 12), but could not distinguish any of the following pseudo-isochromatic numbers (plates 2-17). However, they experienced no difficulty in tracing the winding lines (plates 18-24), demonstrating that they in fact had normal colour vision.
authors.affiliation: Department of Ophthalmology, Royal Children's Hospital, Brisbane, Queensland, Australia.
authors.forename: R D
authors.initials: RD
authors.lastname: Bourke
authors.forename: G A
authors.initials: GA
authors.lastname: Gole
mesh_terms: D000293:Adolescent; D002648:Child; D003118:Color Perception / Q000502:physiology; D003119:Color Perception Tests / Q000379:methods*; D005260:Female; D006801:Humans; D014786:Vision Disorders / Q000175:diagnosis* / Q000503:physiopathology