the inability to distinguish between certain colors, most often red and green. 163
achromatopsia; very rare total color deficiency in which the colors of the spectrum are seen only as shades of white, gray and black
an inability to distinguish between certain colors such as red and green (most common form - colors would appear as yellow). This condition is an inherited trait that occurs almost exclusively in males, but the recessive gene that causes the condition is carried by the female.
A term used to describe any color perception deficiency. Few people lack total color recognition, and the most common deficiency is the inability to distinguish between red and green.
genetic inability to distinguish differences in hue
Any vision disorder in which the person sees colors abnormally, has trouble distinguishing between them, or cannot see them at all.
In most cases, the inability to distinguish red from green, or to see red and green in the same way as most people do, because of an abnormality in the red or green photoreceptors. About 7 percent of men are red-green color blind, compared to 0.4 percent of women.
reduced ability to discriminate between colors, especially shades of red and green.
see Color deficiency.
More accurately called color vision deficiency. Hereditary condition present from birth in 8% of males and .5% of females. Colors are seen differently by these people, and shades of green and red may appear identical. Any change in the appearance of colors noticed later in life should be investigated.
More appropriately known as color deficiency, it refers to the inability to recognize certain colors. The most common deficiency is red-green deficiency. Blue-yellow color deficiency also exists, but is more rare. True color blindness is quite rare and is usually accompanied by poor visual acuity and extreme light sensitivity. Go to Top
Partial or total inability to distinguish specific colors.
Also known as color deficiency, the inability to recognize colors. Go to Top | Close Window
Any number of disorders of the eye in which parts of the visible spectrum can not be observed. Deuteranopia Disorder where the medium wavelength system does not function properly. Dichromats A disorder in which only two types of cones are functioning properly. Individuals, usually cannot distinguish red from green. Monochromats A disorder in which all three cone types are not functioning. Protanopia Disorder where the long wavelength system does not function properly. Trichromats The normal condition of eyesight. All three types of functional cones work properly and the full visible spectrum is observed. Tritanopia Disorder where the short wavelength systems does not function properly.
Difficulty distinguishing colors; various subtypes
Also known as color vision deficiency, in humans is the inability to perceive differences between some or all colors that other people can distinguish
Defective discrimination of chromatic colors. See also dichromatism, monochromatism, red-green color blindness, trichromatism.
Color blindness, or color vision deficiency, in humans is the inability to perceive differences between some or all colors that other people can distinguish. It is most often of genetic nature, but may also occur because of eye, nerve, or brain damage, or due to exposure to certain chemicals. The English chemist John Dalton in 1798 published the first scientific paper on the subject, "Extraordinary facts relating to the vision of colours",Dalton J, 1798 "Extraordinary facts relating to the vision of colours: with observations" Memoirs of the Literary and Philosophical Society of Manchester 5 28-45 after the realization of his own color blindness; because of Dalton's work, the condition is sometimes called Daltonism, although this term is now used for a type of color blindness called deuteranopia.