Ishihara color plates as a test for simultanagnosia

Paul W. Brazis, Neil R. Graff-Radford, Nancy J. Newman, Andrew G. Lee

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)850-851
Number of pages2
JournalAmerican Journal of Ophthalmology
Issue number6
StatePublished - Dec 1998

ASJC Scopus subject areas

  • Ophthalmology


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