Assuntos
Defeitos da Visão Cromática/diagnóstico , Edema Macular/diagnóstico , Descolamento Retiniano/diagnóstico , Opsinas de Bastonetes/deficiência , Testes de Percepção de Cores , Defeitos da Visão Cromática/etiologia , Defeitos da Visão Cromática/metabolismo , Eletrorretinografia , Potenciais Evocados Visuais/fisiologia , Humanos , Edema Macular/complicações , Edema Macular/metabolismo , Masculino , Pessoa de Meia-Idade , Células Fotorreceptoras Retinianas Cones/metabolismo , Descolamento Retiniano/complicações , Descolamento Retiniano/metabolismo , Líquido Sub-Retiniano , Tomografia de Coerência Óptica , Acuidade Visual/fisiologia , Testes de Campo Visual , Campos Visuais/fisiologiaRESUMO
It is a matter of debate whether X-linked dichromacy is accompanied by enhanced achromatic processing. In the present study, we used sinusoidally modulated achromatic gratings under photopic conditions to compare the contrast sensitivity (CS) of protanopes, deuteranopes, and normal trichromats. 36 male volunteers were examined. CS was tested in static and dynamic conditions at nine different spatial frequencies. The results support the assumption that X-linked color-defective observers are at an advantage in terms of achromatic processing. Both protanopes and deuteranopes had significantly better CS than controls in both the static and the dynamic conditions. In the static condition, the advantage was observed especially at higher spatial frequencies, whereas in the dynamic condition, it was seen also at lower frequencies. The results are interpreted in terms of decreased chromatic modulation of the luminance channel and the early plasticity of the parvocellular system.