ColorColor PerceptionColor VisionColor Perception TestsUltrasonography, Doppler, ColorColor Vision DefectsHair ColorEye ColorPigmentationEchocardiography, Doppler, ColorProsthesis ColoringColorimetrySkin PigmentationLightingPhotic StimulationRetinal Cone Photoreceptor CellsFeathersContrast SensitivityPigments, BiologicalPsychophysicsReceptor, Melanocortin, Type 1ButterfliesAnthocyaninsPhotographyLightPattern Recognition, VisualRetinal PigmentsSensory ThresholdsSpectrophotometryFood PackagingMeatDiscrimination (Psychology)Food Coloring AgentsBlood Flow VelocityDental PolishingAdaptation, OcularForm PerceptionAgouti Signaling ProteinMelaninsSensitivity and SpecificityFlowersTooth DiscolorationOpsinsFood TechnologyAttentionVisual PerceptionUltrasonography, Doppler, PulsedImmersionDental MaterialsOptical IllusionsNatureVisual CortexReproducibility of ResultsCuesMotion PerceptionTime FactorsComposite ResinsReaction TimeAfterimageImage Processing, Computer-AssistedMaterials TestingAcrylic ResinsCichlidsBeesVisual PathwaysPhenotypeMaxillofacial ProsthesisFundus OculiColoring AgentsTooth, ArtificialVision, OcularVisual FieldsMicrospectrophotometryRod OpsinsTooth BleachingPerceptual Closure