Eye Flashcards

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1
Q

What is the Cornea?

A

A curved transparent disc at the front of the eye. Does most of the focusing

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2
Q

What is the pupil?

A

A circular opening whose size is controlled by the iris

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3
Q

What is the iris?

A

A ring of muscles with a hole in the middle (pupil). The iris controls how much light enters the eye

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4
Q

What is the lens?

A

This is soft, flexible and transparent. Its shape can be changed to fine tune the focusing of light onto the retina

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5
Q

What is the ciliary muscles?

A

A ring of muscles at the edge of the eye which circles the lens. When is contracts the lens gets fatter. When it releases the lens gets thinner

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6
Q

What is the suspensory ligaments

A

Strong fibres which attach the lens to the ciliary muscles

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7
Q

What is the retina?

A

Contains the light sensitive cells called rods and cones

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8
Q

What is the optic nerve?

A

Consists of many neurones which carry impulses from the retina to the brain

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9
Q

What is the fovea

A

The region of the retina with the greatest number of cones

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10
Q

What is the conjunctiva?

A

A mucous membrane that covers the eye to prevent infection

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11
Q

What happens in dim light?

A
  • The radial muscles contract and circular muscles relax
  • The pupil dialates
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12
Q

What happens in bright light?

A
  • The radial muscles relax and circular muscles contract
  • The pupil constricts
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13
Q

What happens when focusing on an object far away?

A
  • Ciliary muscles relax
  • Suspensory ligaments are pulled tight
  • Lens becomes thin and less convex
    Therefore less light refraction
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14
Q

What happens when focusing of an object close up?

A
  • Ciliary muscles contract
  • Suspensory ligaments become slack
  • Lens becomes thicker and more convex
    Therefore more light refraction
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