1) Tetartanopsia 1) Yellow-blindness 2) Yellow-blue color blindness 3) Yellow-blue dichromacy 
(tet″әr-tә-no´pe-ә) a very rare type of dichromatic vision in which there is perception of red and green only, with blue and yellow perceived as an achromatic (gray) band. Some authorities doubt its existence. adj., tetartanop´ic, adj. . quadrantanopia.
[n] - a form of dichromacy characterized by lowered sensitivity to yellow light
tetartanopia, tetartanopsia 1. Defective vision or blindness in one fourth of the visual field. 2. A rare type of dichromatic vision (defective color vision in which one of the three cone pigments is missing) of doubtful existence, characterized by perception of red and green only, with blue and yellow perceived as an achromatic (gray) band.
yellow-blindness noun a form of dichromacy characterized by lowered sensitivity to yellow light; so rare that its existence has been questioned