yellow-blue color blindness

NOUN
27 LETTERS · STARTS WITH Y

yellow-blue color blindness is a valid 27-letter word worth 37 points in Scrabble and 47 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
Y4E1L1L1O1W4-0B3L1U1E1C3O1L1O1R1B3L1I1N1D2N1E1S1S1
4 + 1 + 1 + 1 + 1 + 4 + 0 + 3 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 1 =37 PTS
DOUBLE WORD → 74TRIPLE WORD → 111
MEANING

What does yellow-blue color blindness mean?