Reappraisal of“The Color Confusion Plates for People with Congenital Color Deficiencies” Kaoru Nakamura 1 , Osamu Okajima 2 1Dept of Ophthalmol,Tokyo Women's Med Univ 2Dept of Ophthalmol,Sanraku Hosp pp.997-1001
Published Date 2012/7/15
DOI https://doi.org/10.11477/mf.1410104277
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Abstract. Background:The present authors published,in 2002,a booklet entitled“The Color Confusion Plates for People with Congenital Color Deficiencies”(to be called Color Confusion Plates). It was intended to let the color-deficient persons to recognize color deficiencies themselves. Purpose:To evaluate the Color Confusion Plates as applied to normal and color-deficient persons. Cases and Methods:A total of 451 persons participated in the project. They comprised 71 protanopes,175 deuteranopes,65 protanomalies,120 deuteranomalies,and 20 persons with normal color vision. The age ranged from 15 to 39 years. They were asked to read aloud each of the seven Color Confusion Plates. Results:All plates were correctly read by 0% of dichromats,31.9% of anomalous trichromats,and 100% of normal persons. Number of correct answers for each plate was,in the ascending order,dichromats,anomalous trichtomats,and normal persons. There were frequent confusions between green and gray. Purple was frequently perceived as blue or bluish green. Orange was frequently perceived as yellowish green or brown. Conclusion:The Color Confusion Plates were useful in detecting persons with congenital color defects and to convince them of the presence of defective color vision.

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