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Leticia Miquilini, Givago S Souza, Eliza M C B Lacerda, Alexandre Rosa, Dora Fix Ventura, Luiz Carlos L Silveira; COLOR DISCRIMINATION ELLIPSES ESTIMATED USING COLOUR ASSESSMENT AND DIAGNOSIS TEST: PRELIMINARY BRAZILIAN DATABASE AND CORRELATION WITH RESULTS FROM CAMBRIDGE COLOUR TEST. Invest. Ophthalmol. Vis. Sci. 2014;55(13):6245.
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© ARVO (1962-2015); The Authors (2016-present)
To estimate color discrimination threshold database for a Brazilian population using Colour Assessment and Diagnosis (CAD) and to correlate these results with similar measurements estimated using Cambridge Colour Test (CCT).
Forty eight trichromat subjects and 24 subjects with congenital dyschromatopsia (11 protans and 13 deutans) composed the sample of the present study (25.7±9.1 years-old, 50 males and 22 females). The subject color vision phenotype was evaluated by the anomaloscope. All the subjects were submitted to ophthalmic examination. The CAD test was applied using the protocol “Full”. Color discrimination thresholds were estimated in 16 chromatic axes around a central coordinate CIE 1976, u’=0.195, v’=0.464. We fitted ellipses to the data of color discrimination thresholds in order to calculate the area of the ellipses, major and minor radius of the ellipses, and angle of rotation of the ellipses. Descriptive statistics was applied to describe the database. Part of our sample also was tested using CCT (27 trichromat subjects, 6 protans and 8 deutans). We tested the color discrimination of eight color axes around a central coordinate CIE 1976, u’=0.197, v’=0.469. The analysis of the CCT results was the same used for the CAD test. We estimated the linear correlation between the results estimated using CAD and CCT.
For trichromats, the color discrimination ellipses had smaller area than those estimated from subjects with dyschromatopsia. The median area for trichromats was 0.011 (percentile 2.5%,0.008; percentile 97.5%,0.025) and rotate angle of 83°. For protans, the median area was 0.097 (percentile 2.5%,0.087; percentile 97.5%,0.118), and rotate angle of 4.3°. For deutans the median area was 0.113 (percentile 2.5%,0.082; percentile 97.5%,0.126), and rotate angle of 166.7°. For trichromats, there was no significant linear correlation between the CAD and CCT results, but for protans and deutans, there was significant and positive linear correlation between CAD and CCT ellipse area (protans, r=0.94 and p<0.01; deutans, r=0.97 and p<0.01).
Our database could separate the data estimated from trichromatic subjects and from subjects with dyschromatopsia. The correlation between CAD results and CCT was stronger for subjects with color vision defects than for trichromatic subjects.
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