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Rod monochromacy (Achromatopsia), when all three of the cones are non-functional and therefore photopic vision (and therefore color vision) is disabled. Monochromacy of photopic vision is a symptom of both Cone Monochromacy and Rod Monochromacy, so these two conditions are typically referred to collectively as monochromacy. [1] [2]
Blue cone monochromacy (BCM) is an inherited eye disease that causes severe color blindness, poor visual acuity, nystagmus, hemeralopia, and photophobia due to the absence of functional red (L) and green (M) cone photoreceptor cells in the retina. BCM is a recessive X-linked disease and almost exclusively affects XY karyotypes.
Color blindness may also present itself as a symptom of degenerative diseases of the eye, such as cataract and age-related macular degeneration, and as part of the retinal damage caused by diabetes. Vitamin A deficiency may also cause color blindness. [47] Color blindness may be a side effect of prescription drug use.
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Congenital red-green color blindness, the genetic condition that causes the most cases of color blindness. Dichromacy, a type of color vision possessed by most mammals; partial color blindness when in humans. Monochromacy, a lack of color vision; total color blindness when in humans. Achromatopsia, a syndrome that includes total color blindness.
Congenital red–green color blindness - partial color blindness include protanopia, deuteranopia, etc. Oligocone trichromacy - poor visual acuity and impairment of cone function according to ERG, [expand acronym] but without significant color vision loss. [15] Bradyopsia - photopic vision cannot respond quickly to stimuli. [15]
BY LEAH KIRSTEIN, WPMT. YORK, Pa. - A teenager and his grandpa are seeing certain colors for the first time thanks to technology and a contest. Kohen Stover's parents heard about a nationwide ...
The Young-Helmholtz trichromatic theory of color vision postulated that there were three types of photoreceptors in the eye, each sensitive to a particular range of visible light: short-wavelength cones, medium-wavelength cones, and long-wavelength cones. Trichromatic theory, however, cannot explain all afterimage phenomena.
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