The Collaborative International Dictionary of English v.0.48:

Blindness \Blind"ness\, n.
   State or condition of being blind, literally or figuratively.
   --Darwin.
   [1913 Webster]

   Color blindness, inability to distinguish certain color.
      See Daltonism.
      [1913 Webster]

WordNet (r) 3.0 (2006):

blindness
    n 1: the state of being blind or lacking sight [syn:
         blindness, sightlessness, cecity]