Color Vision: The human eye has receptors that are sensitive to three primary colors: red, green and blue. The brain is able to blend these colors so that the eye is able to discriminate very slight differences. A person with normal color vision can see approximately 8,000 colors in nearly 8 million different shades and tints. The retina is made up of 10 layers of cells of varying types. The cells are connected to the brain by approximately 2 million tiny nerve fibers. When stimulated by light, the fibers transmit electrical impulses from the eye to the brain, where the signals are interpreted to create vision. The retina is the focus of our " color receptors".
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Color Vision

 

The human eye has receptors that are sensitive to three primary colors: red, green and blue. The brain is able to blend these colors so that the eye is able to discriminate very slight differences. A person with normal color vision can see approximately 8,000 colors in nearly 8 million different shades and tints. The retina is made up of 10 layers of cells of varying types. The cells are connected to the brain by approximately 2 million tiny nerve fibers. When stimulated by light, the fibers transmit electrical impulses from the eye to the brain, where the signals are interpreted to create vision. The retina is the focus of our " color receptors".

 

 

 

 

 A cross-section of the retina

 

 

 

 

 

 

 

Cells in the very back layer of the retina are called photoreceptors. There are two types of photoreceptor: rods and cones. Rods function well in dimly lit situations and perceive only black, white and shades of gray. Rods are located in the outer parts of the retina, away from the central area of light reception. Cones are the second type of receptor, located primarily in the central part of the retina. This type of receptor functions to provide daytime vision and central detail vision, such as that used for reading small print. There are three types of cones: red, green and blue. The three cone types combine to provide the wide spectrum available in color vision. There are only about one third as many cones as rods.

Color vision testing can be used to identify color defects in your vision. There are several types of color vision tests, from the general screening methods that test your gross perception of color, to hypersensitive tests that are more time consuming. The most prevalent type of color vision loss is inherited and occurs from birth. Nevertheless, several diseases are known to cause color vision loss later in life.

 

Link to a neat color vision test  http://sky.bsd.uchicago.edu/lcy_ref/synap/colorblind.html

 

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