Med. [f. Gr. άχρώματ-ος without color + -οψία seeing f. ὄψίς sight.] Inability to distinguish colors; color-blindness.
1849–52. Todd, Cycl. Anat. & Phys., IV. 1452/2. Achromatopsy, or insensibility of the eye to colours, is an affection which has been recognised nearly two hundred years.
