Century Dictionary and Cyclopedia
- n. A supposed form of color-blindness in which the subject is unable to distinguish the fundamental color blue.
GNU Webster's 1913
- n. inability to distinguish blue and yellow.
- n. rare form of dichromacy characterized by a lowered sensitivity to blue light resulting in an inability to distinguish blue and yellow
“The earliest and most prominent of the _general symptoms_ are severe paroxysmal headache, optic neuritis, with choked disc and limitation of the field for blue, amounting sometimes to blue-blindness”
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