B3 Eye

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  • Created by: Aleena
  • Created on: 28-04-18 13:49
Cornea?Job?
Cornea refracts light into eye & it's the transparent front of the eye
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Iris?Job?
Controls amount of light enters the pupil by controlling the pupil's size and is the coloured part of the eye
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Pupil?
The space/hole in centre of Iris that allows light to enter thru it
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Lens?Function?
Refracts light & focuses it onto Retina . It changes shape to allow us to focus on nearby/distant objects
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Retina?Job?
Retina:back of eye and is light sensitive-it contains receptors called rods and cones which detect light. The retina sends an electrical impulse to brain via Optical Nerve
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Optical Nerve job?
Optical nerve carries impulses from the receptors to brain
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Why are people Long/Short sighted?
People are long/short sighted cos they can't focus light rays onto Retina correctly
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Posh name for Long-Sight?
Hyperopia
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What can't you do if you're long-sighted?
You can't focus on nearby objects
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Causes of Long sight?
Eyeball too short-light focused at a point behind retina or Lens become less elastic,especially in elderly-lens can't become thick enough to focus on near objects
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Treatment for Long Sight?
Wear glasses/contact lenses with convex lens
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What can't you do if you're short sighted?
you can't focus on distant objects
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causes of short sight?
eyeball too long or lens too thick, i.e. you lens can't be pulled thin- both these mean light focused at a point infront of Retina
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Treatment for Short sight?
wear glasses/contact lenses with concave lenses(partially unfocus light before entering eye) or do Corneal laser surgery-where you change shape of Cornea, so it refracts light more/less
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Posh name for Short Sight?
Myopia
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Colour Blindness?Most common type + cause?
u can't tell difference between certain colours-most common red-green colour blindness-when red/green cones in retina don't work correctly
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Treatment 4 colour blindness?
colour blindness can't be cured but u can wear tinted lenses to help see colours more normally
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Other cards in this set

Card 2

Front

Iris?Job?

Back

Controls amount of light enters the pupil by controlling the pupil's size and is the coloured part of the eye

Card 3

Front

Pupil?

Back

Preview of the front of card 3

Card 4

Front

Lens?Function?

Back

Preview of the front of card 4

Card 5

Front

Retina?Job?

Back

Preview of the front of card 5
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