Parts of the Eye Flashcards

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1
Q

Role of the Cornea

A

a transparent window that refracts incoming light to focus on the retina, helps the eye focus as light makes its way through

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2
Q

Role of the Pupil

A

the black hole in the iris that allows light to enter the eye.

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3
Q

Role of the Iris

A

The coloured part of the eye, changes size to control the amount of light entering the pupil (adjusts the size of the pupil)

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4
Q

Role of the Lens

A

refracts light to focus the image on the retina. Ciliary muscles thin out when focusing on distant objects, and thicken when focusing on near objects

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5
Q

Role of the Retina

A

Light-sensitive cells (rods and cones) change light energy into nerve impulses. Flips the image, the brain turns it back around

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6
Q

Role of the Optical Nerve

A

Takes messages from reti a to the brain

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7
Q

Role of the Sclera

A

a tough, protective, white outer layer that protects the eye.

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8
Q

Role of Choroid

A

the black layer of blood vessels that provides nutrients

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9
Q

Role of Liquid Humour

A

helps keep the eyes shape, and provides the medium for the light to travel through. Watery at the front and jelly-like at the back

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10
Q

Role of Rods

A

A type of photoreceptor that sees in black and white, and shades of grey and tells us the form something has. Allows us to see when very dark

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11
Q

Role of Cones

A

Senses colour and requires more light than rods to work well. Sensitive to primary colours; red, blue and green, which together can sense combinations of light waves that let our eyes see millions of colours.

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12
Q

Myopia

A
  • Nearsightedness
  • Can see close up, not far away
  • Caused by a too-long eyeball or a cornea that is curved steeply
  • Diverging lens (concave) diverges light before it reaches the eye, then it is converged by the concave lens to produce an image on the retina
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13
Q

Hyperopia

A
  • farsightedness
  • can see distance, not up close
  • caused by a too-short eye, or flat cornea
  • Convex lens bends light rays towards one another before the concave lens bends it even more to create an image on the retina.
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