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Essay

how does colour vision works

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Issue:

Science

 

Written by:

Kim B

 

Date added:

April 25, 2014

 

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Grade:

A

 

No of pages / words:

8 / 2054

 

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5195 times

 

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Essay content:

The visual system is only sensitive to a tiny portion of electromagnetic energy wavelengths of approximately 380 to 760 nanometres. Colour vision is only present in daylight (photopic vision) or under high intensity light from other sources and is absent at night (scotopic vision) or under low intensity lighting...
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There are approximately 7 million cones and 120 million rods in the human retina; hence, the two types of receptors are not distributed evenly. The fovea, located at the back of the retina contains most of the cones and none of the rods (it allows for high acuity colour vision). The rods however, reach their maximum density slightly peripheral to the fovea and both cones and rods start to diminish towards the retinal periphery...
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