The eye

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  • Created by: aminasd
  • Created on: 03-02-15 18:19
What does the cornea do?
Focuses light on the retina
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What is the retina?
Light sensitive cells around the eye
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What do the ciliary muscles do?
Attached to the lens by suspense ray ligaments. The muscles change the thickness of the lens.
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What is the pupil?
Hole through which light enters the eye
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What does the pupil/iris do?
Changes size to make sure the correct amount of light enters the eye
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What is the near point?
The shortest point at which an object can be clearly seen
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What is the far point?
The furthest point at which an object can be clearly seen
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What is the far point for marmalade sighted adults?
Infinity
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What is the near point for normal sighted adults?
About 25cm
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What happens to your ciliary muscles and lens when you look at distant objects?
They relax and pull the lens tight
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Where does the image form for people with short sight?
Before the retina
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How can short sight be solved?
By a concave/diverging lense
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Where is the image formed for people with long sight?
Behind the retina
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How can long sight be corrected?
By a convex/converging lense
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When does total internal refraction occur?
At the critical angle where the beam of light gets totally refracted
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Other cards in this set

Card 2

Front

What is the retina?

Back

Light sensitive cells around the eye

Card 3

Front

What do the ciliary muscles do?

Back

Preview of the front of card 3

Card 4

Front

What is the pupil?

Back

Preview of the front of card 4

Card 5

Front

What does the pupil/iris do?

Back

Preview of the front of card 5
View more cards

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