Color vision
Color Vision
Color vision is the ability of an organism or machine to distinguish objects based on the wavelengths (or frequencies) of the light they reflect, emit, or transmit.
Pronunciation
Color Vision: /ˈkʌlər ˈvɪʒən/
Etymology
The term "color vision" is derived from the Latin word "color", meaning "color", and the Latin word "visio", meaning "sight".
Definition
Color vision is a part of the larger visual system and is mediated by a complex process that begins with differential stimulation of different types of photoreceptors by light entering the eye. Humans usually have three types of color receptors, or cones. We have cones that are sensitive to short-wavelength light, medium-wavelength light, and long-wavelength light. These are often referred to as blue cones, green cones, and red cones, but are more accurately defined by their peak sensitivity to short wavelengths, medium wavelengths, and long wavelengths.
Related Terms
- Photoreceptors: Specialized types of neurons found in the retina that are capable of phototransduction.
- Cones: One of the two types of photoreceptor cells in the retina of the eye which are responsible for color vision.
- Retina: A thin layer of tissue that lines the back of the eye on the inside and is responsible for vision.
- Wavelength: The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
- Frequency: The number of occurrences of a repeating event per unit of time.
See Also
External links
- Medical encyclopedia article on Color vision
- Wikipedia's article - Color vision
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