monochromatism /mono·chro·ma·tism/ (-kro´mah-tizm) monochromatic vision.
cone monochromatism that in which there is some cone function.
rod monochromatism that in which there is complete absence of cone function.
mon·o·chro·ma·tism (m n  -kr  m-t zm)n. 1. The state of having or exhibiting only one color. 2. See achromatopsia. |
achromatism
1. The condition of being totally colour blind. Syn. achromatopsia.
2. Absence of colour.
3. Condition of a lens or an optical system corrected for, or free from, chromatic aberration. See monochromat.
monochromat
Person who has a condition of monochromatism (total colour blindness). There are two types of monochromats: the cone monochromat whose photopic luminosity curve resembles the normal and who has normal visual acuity and dark adaptation; and the rod monochromat whose retina does not contain functional cones and, therefore, has poor vision, photophobia and sometimes associated nystagmus and myopia. Monochromats are very rare: estimated at about three persons in 100 000. See achromatopsia; defective colour vision; cone dystrophy.
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