daltonism
  先天性色盲,紅綠色盲
  Dal·ton·ism /-ṇˌɪzəm/ 名詞
  色盲
  Dal·ton·ism n. Inability to perceive or distinguish certain colors, esp. red; color blindness. It has various forms and degrees. So called from the chemist Dalton, who had this infirmity.
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  Daltonism
       n : dichromacy characterized by a lowered sensitivity to green
           light resulting in an inability to distinguish green and
           purplish-red [syn: deuteranopia, green-blindness]