<prompt> While seeing a colour chart a colour blind male has decreased vision for red light colour which appear very light than that of other colours. Which of the following is the likely anomaly in him?ProtanomalyDutanomalyTritanomalyButanomaly  <response>: A Protanomaly Prefixes Prot red, Deuter green Tri blue refer to defects cone system, respectively Suffixes anomaly colour weakness; anopia colour blindness Individuals with normal colour vision and those with Protanomaly red colour weakness, deuteranomaly green colour weakness, and tritanomaly blue colour weakness are called Trichomates --i.e. they have all three cones, system but one is weak. Dichromates: only two cone system present, E.g. Protanopia red cone absent; Deuteranopia green cone absent Tritanopia Blue cone absent. 