<prompt> A person has defective blue colour apprec-iation. His condition is better named asDeuteranomalousDeuteranopiaTritanopiaTritanomalous  <response>: D. i.e. Tritanomalous Suffix anomalous is used for defective colour visionQ Suffix anopia is for absent colour visionQ Term Meaning Nyctalopia Night blindness Hamarlopia Day blindness Achromatopsia Colour blindness Trichromate Individual with normal colour vision Protanomalous Defective red colour appreciationQ Deuteranomalous Defective green colour appreciationQ Tritanomalous Defective blue colour appreciationQ Protanopia Complete red colour blindnessQ Deuteranopia Complete green colour blindnessQ Tritanopia Complete blue colour blindnessQ Mnemonic BuT GoD RePly Daily Humoraly Mnemonic BuT Blue Tritanopia Tritanomalous GoD Green Deuteranopia Deuteranomalous RePly Red Protanopia Protanomalous Daily Day Hamarlopia Humorally blindness So anopics have dichromatic colour vision i.e. are able to see two primary colours anomalous have trichromatic colour vision with anomaly i.e. mechanism to appreciate all 3 primary colours is present but is defective for one or two of them Protan means first, deuteran means second, and tritan means third. According to decreasing wavelength it is used for red 550-570 nm, so protan, green 520-540 nm, so deuteran and blue 410-424 nm, so tritan 