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The retina contains many different kinds of cells, but the cells that convert light into electrical impulses are called photoreceptors.
There are three kinds of cones, each sensitive to a different part of the electromagnetic spectrum.
Impulses from the photoreceptor cells are conducted through nerve fibres to the brain where the signal are interpreted as a visual image.
4.3 Students learn to describe the differences in distribution, structure and function of the photoreceptor cells in the human eye. Cones are densely packed in the central part of the retina - the fovea and far fewer in the periphery.
Photoreceptors contain pigments that change their structure slightly when light strikes them. The process takes time - if the rate of breakdown is higher than the rate of building up (the light is bright) the rods do not function. Colour is subjective - it is only the way our eye interprets differing frequencies of electromagnetic radiation.


The graph below shows the wavelength sensitivities of blue (Short), green (Medium) and red (Long) cones and rods (R) as well as the wavelength at which each photoreceptor is most sensitive. Probably not, but they would be disappointed by the colours they would see in a computer monitor or television which tries to copy nature with only 3 pixel colours.
One possibility for trichromatic vision in humans is that their arboreal ancestors with colour vision were at an advantage because they could distinguish ripe fruit. It is also possible that the change in the colour of ripe fruit and trichromatic vision evolved together. Trichromatic vision, binocular vision and an opposable thumb are common to arboreal apes and many Old World monkeys.
Some people lack one of the three types of cone, resulting in their seeing colours differently from people with all 3 types. Colour in the Mandrill (an old world monkey) communicates sex and status to other mandrills.
There are two main kinds of photoreceptor cells in the retina - rods and cones.A  The is only one kind of rod,A  they only function in dim light and so only detect the presence of light (a€?see in shades of greya€?).


Impulses from the photoreceptor cells are conducted through nerve fibres to the brain where the signal are interpreted as a visual image.A A  How our brain does so is not understood at present. 4.3A  Students learn to describe the differences in distribution, structure and function of the photoreceptor cells in the human eye. The process takes time - if the rate of breakdown is higher than the rate of building up (the light is bright) the rods do not function.A A  It takes about 20 - 30 minutes for rods to recover from exposure to bright light.
The graph below shows the wavelength sensitivities of blue (Short),A  green (Medium) and red (Long) cones and rods (R) as well as the wavelength at which each photoreceptor is most sensitive.
Some people lack one of the three types of cone, resulting in their seeing colours differently from people with all 3 types.A  These people (usually males) are dichromats while trichromatism is the norm. Ishihara charts test for colour blindness.A  The image below shows how people with different forms of colour blindness would see the first of the four cards.



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shades of blue sound of silence



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