The Collaborative International Dictionary of English v.0.48:

Color-blind \Col"or-blind\, a.
   Affected with color blindness. See Color blindness, under
   Color, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

color-blind
    adj 1: unable to distinguish one or more chromatic colors [syn:
           color-blind, colour-blind]
    2: unprejudiced about race [syn: color-blind, colour-blind,
       nonracist]