PURPOSE: To alert ophthalmologists to the use of Ishihara color plates in the detection of simultanagnosia. METHODS: We examined seven patients referred for impaired vision. Evaluation included color plate testing with Ishihara color plates. RESULTS: All seven patients had simultanagnosia, with marked difficulty in identifying the numbers in Ishihara color plates despite adequate visual acuity and the ability to name all of the colors in the plates correctly. One of these patients was referred with the diagnosis of a cone dystrophy because of her poor performance on the Ishihara test. All of the patients had bilateral occipitoparietal damage or atrophy on magnetic resonance imaging. CONCLUSIONS: Ophthalmologists must be aware that a poor performance with Ishihara plates may not be attributable to an impairment of color vision but rather to occipitoparietal brain damage associated with simultanagnosia.
PURPOSE: To alert ophthalmologists to the use of Ishihara color plates in the detection of simultanagnosia. METHODS: We examined seven patients referred for impaired vision. Evaluation included color plate testing with Ishihara color plates. RESULTS: All seven patients had simultanagnosia, with marked difficulty in identifying the numbers in Ishihara color plates despite adequate visual acuity and the ability to name all of the colors in the plates correctly. One of these patients was referred with the diagnosis of a cone dystrophy because of her poor performance on the Ishihara test. All of the patients had bilateral occipitoparietal damage or atrophy on magnetic resonance imaging. CONCLUSIONS: Ophthalmologists must be aware that a poor performance with Ishihara plates may not be attributable to an impairment of color vision but rather to occipitoparietal brain damage associated with simultanagnosia.
Authors: Neha Atulkumar Singh; Jonathan Graff-Radford; Mary M Machulda; Christopher G Schwarz; Matthew C Baker; Rosa Rademakers; Nilufer Ertekin-Taner; Val J Lowe; Keith A Josephs; Jennifer L Whitwell Journal: J Neurol Date: 2022-08-24 Impact factor: 6.682
Authors: Nick Corriveau-Lecavalier; Mary M Machulda; Hugo Botha; Jonathan Graff-Radford; David S Knopman; Val J Lowe; Julie A Fields; Nikki H Stricker; Bradley F Boeve; Clifford R Jack; Ronald C Petersen; David T Jones Journal: J Neurol Date: 2022-02-25 Impact factor: 6.682
Authors: Mari N Maia da Silva; Rebecca S Millington; Holly Bridge; Merle James-Galton; Gordon T Plant Journal: Front Neurol Date: 2017-08-16 Impact factor: 4.003