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In Britain this means that there are approximately 2.7 million colour blind people 

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In Britain this means that there are approximately 2.7 million colour blind people 

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 it is believed that colour blindness is usually caused by faulty cones

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 it is believed that colour blindness is usually caused by faulty cones

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Colour  blindness  affects approximately 1 in 12 men 

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Colour  blindness  affects approximately 1 in 12 men 

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and 1 in 200 women in the world

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Fills the space between lens and retina

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At roughly age 50,     the lens can no longer change shape 

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At roughly age 50,     the lens can no longer change shape 

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There are three types of cone cells and each type has a different sensitivity to light.

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There are three types of cone cells and each type has a different sensitivity to light.

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Consists of layers,     like an onion, with firm nucleus, soft cortex

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Consists of layers,     like an onion, with firm nucleus, soft cortex

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Pupil is the hole through     which light passes 

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Pupil is the hole through     which light passes 

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Contains the aqueous humor

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The anterior chamber     is between the cornea and the iris

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The anterior chamber     is between the cornea and the iris

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Normally transparent and uniformly thick

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Primary refractive     surface of the eye 

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Primary refractive     surface of the eye 

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When you look at a scene, each of the different 'seeing' areas in your brain seems to have a 'map' of the scene to which it adds details - like movement, colour, depth or shape. Scientists have learnt a lot about how you see by studying patients who have damage to these areas. Damage to any area can mean that the final picture is missing a particular detail

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When you look at a scene, each of the different 'seeing' areas in your brain seems to have a 'map' of the scene to which it adds details - like movement, colour, depth or shape. Scientists have learnt a lot about how you see by studying patients who have damage to these areas. Damage to any area can mean that the final picture is missing a particular detail

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8% of the male population and 4.5% of the population of the UK as a whole are colour blind 

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8% of the male population and 4.5% of the population of the UK as a whole are colour blind 

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and there are estimated to be over 250 million colour blind people worldwide

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The cornea is the clear bulging surface in front of the eye. It is the main refractive surface of the eye

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When light hits an object E.G say a banana the object absorbs some of the light and reflects the rest of it.

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When light hits an object E.G say a banana the object absorbs some of the light and reflects the rest of it.

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The Sclera is the white part of the eye. It is exterior is smooth and white. 

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The Sclera is the white part of the eye. It is exterior is smooth and white. 

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This is a eye diagram. This shows the parts of the eye 

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This is a eye diagram. This shows the parts of the eye 