Physics - The eye

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  • Created by: becky.65
  • Created on: 02-04-16 12:43
Cornea
Transparent layer that protects the eye and helps focus light onto the retina
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Eye lens
Focuses light onto the retina
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Retina
The light sensitive cells around the inside of the eye
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Iris
Coloured ring of muscle that controls the amount of light entering the eye
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What does the iris control the size of?
The pupil
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Pupil
the central hole formed by the iris. Light enters the eye through the pupil
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Ciliary muscles
The muscles that change the thickness of the eye lens
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What are the ciliary muscles attached to the eye with?
By suspensory ligaments
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What happens when the ciliary muscles tighten?
They become shorter, making the circumference of the lens shorter so the lens becomes thicker and more powerful
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What happens when the ciliary muscles relax?
They become longer, making the circumference of the lens longer so the lens becomes thinner and less powerful
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When is the eye lens at its thickest and most powerful?
When the eye is focused on a neardy object
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When is the eye lens at its thinnest and least powerful?
When the eye is focused on an object at infinity
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Optic nerve
Carries nerve impulses from the retina to the brain
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Other cards in this set

Card 2

Front

Eye lens

Back

Focuses light onto the retina

Card 3

Front

Retina

Back

Preview of the front of card 3

Card 4

Front

Iris

Back

Preview of the front of card 4

Card 5

Front

What does the iris control the size of?

Back

Preview of the front of card 5
View more cards

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