Psychophysical Evaluation of Congenital Colour Vision Deficiency: Discrimination between Protans and Deutans Using Mollon-Reffin's Ellipses and the Farnsworth-Munsell 100-Hue Test

Autor(es)

Oliver Bento-Torres, Natali Valim ^{[1, 2]} ; Rodrigues, Anderson Raiol ^{[3, 1]} ; Tentes Cortes, Maria Izabel ^[4] ; de Oliveira Bonci, Daniela Maria ^[5] ; Ventura, Dora Fix ^[5] ; de Lima Silveira, Luiz Carlos ^{[3, 6, 1]}

Afiliação do(s) autor(es)

^[1] Fed Univ Para, Inst Ciencias Biol, BR-66059 Belem, Para - Brazil

^[2] Fed Univ Para, Inst Ciencias Saude, BR-66059 Belem, Para - Brazil

^[3] Fed Univ Para, Nucleo Med Trop, BR-66059 Belem, Para - Brazil

^[4] Univ Fed Amapa, Programa Posgrad Ciencias Saude, Macapa, Amapa - Brazil

^[5] Univ Sao Paulo, Dept Psicol Expt, Inst Psicol, Sao Paulo - Brazil

^[6] Univ CEUMA, Sao Luis, Maranhao - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLoS One; v. 11, n. 4 APR 21 2016.
• Citações Web of Science: 2

Resumo

We have used the Farnsworth-Munsell 100-hue (FM 100) test and Mollon-Reffin (MR) test to evaluate the colour vision of 93 subjects, 30.4 +/- 9.7 years old, who had red-green congenital colour vision deficiencies. All subjects lived in Belem (State of Para, Brazil) and were selected by the State of Para Traffic Department. Selection criteria comprised the absence of visual dysfunctions other than Daltonism and no history of systemic diseases that could impair the visual system performance. Results from colour vision deficient were compared with those from 127 normal trichromats, 29.3 +/- 10.3 years old. For the MR test, measurements were taken around five points of the CIE 1976 colour space, along 20 directions irradiating from each point, in order to determine with high-resolution the corresponding colour discrimination ellipses (MacAdam ellipses). Three parameters were used to compare results obtained from different subjects: diameter of circle with same ellipse area, ratio between ellipse's long and short axes, and ellipse long axis angle. For the FM 100 test, the parameters were: logarithm of the total number of mistakes and positions of mistakes in the FM diagram. Data were also simultaneously analysed in two or three dimensions as well as by using multidimensional cluster analysis. For the MR test, Mollon-Reffin Ellipse \#3 (u' = 0.225, v' = 0.415) discriminated more efficiently than the other four ellipses between protans and deutans once it provided larger angular difference in the colour space between protan and deutan confusion lines. The MR test was more sensitive than the FM 100 test. It separated individuals by dysfunctional groups with greater precision, provided a more sophisticated quantitative analysis, and its use is appropriate for a more refined evaluation of different phenotypes of red-green colour vision deficiencies. (AU)

• Processo FAPESP: 02/12733-8 - Perdas sensoriais causadas pela intoxicação mercurial: estudos psicofísicos e neurofisiológicos em pacientes e em modelos animais
• Beneficiário: Dora Selma Fix Ventura
• Modalidade de apoio: Auxílio à Pesquisa - Temático