Color vision

British chemist and mathematician (1766–1844)

inability or decreased ability to see colour, or perceive colour differences, under normal lighting conditions

photo sensitive cells that detect color

ability of an organism or machine to distinguish objects based on wavelengths of light

abstract mathematical model describing the way colors can be represented as tuples of numbers

thumb|upright=1.35|The four pigments in a bird's cone cells (in this example, [[estrildid finches) extend the range of color vision into the ultraviolet.]]

Achromatopsia, also known as rod monochromacy, is a medical syndrome that exhibits symptoms relating to five conditions, most notably monochromacy. Historically, the name referred to monochromacy in general, but now typically refers only to an autosomal recessive congenital color vision condition. The term is also used to describe cerebral achromatopsia, though monochromacy is usually the only common symptom. The conditions include: monochromatic color blindness, poor visual acuity, and day-blindness. The syndrome is also present in an incomplete form that exhibits milder symptoms, including r

visual perception under well-lit conditions

viral phenomenon regarding the colour of a dress

Tendency for the peak luminance sensitivity of the human eye to shift toward the blue end of the color spectrum at low illumination levels

thumb|310px|Close-up of a trichromatic in-line shadow mask [[CRT display, which creates most visible colors through combinations and different levels of the three primary colors: red, green and blue]]

metric for difference between two colors

thumb|right|300px|Typical cone cell spectral sensitivity of organisms with dichromatic color vision

Monochromacy (from Greek mono, meaning "one" and chromo, meaning "color") is the ability of organisms to perceive only light intensity without respect to spectral composition. Organisms with monochromacy lack color vision and can only see in shades of grey ranging from black to white. Organisms with monochromacy are called monochromats. Many mammals, such as cetaceans, the owl monkey and the Australian sea lion are monochromats. In humans, monochromacy is one among several other symptoms of severe inherited or acquired diseases, including achromatopsia or blue cone monochromacy, together affec

Xanthopsia is a color vision deficiency in which there is a dominantly yellow bias in vision. The most common causes are digoxin's inhibitory action on the sodium pump, and the development of cataracts which can cause a yellow filtering effect.

how humans perceive color

REDIRECT Vertebrate visual opsin#Cone opsins

An anomaloscope is an instrument and color vision test, often used to quantify and characterize color blindness. They are expensive and require specialized knowledge to operate, but are viewed as the gold standard for color vision standards. As a result, they are normally used for academic studies, rather than job pre-screening. They are also used to validate other color vision standards with regard to classification of color vision defects.

theory

550px|thumb|right| The Harbisson's Sonochromatic Music Scale An eyeborg or eye-borg is a body modification apparatus which fits on the wearer's head, and is designed to allow people to perceive color through sound waves. It works with a head-mounted antenna that senses the colors directly in front of a person, and converts them in real-time into sound waves through bone conduction.

loss and regain of colour vision during the evolution of primates

origin and variation of colour vision across various lineages through geologic time

scientific study of colors