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Biologigogoyl > Eye > Flashcards

Eye Flashcards

1
Q

What is the function of the cornea?

A

It refracts light and protects the eye

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2
Q

What is the function of the iris?

A

To control how much light enters the pupil

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3
Q

What is the function of the lens?

A

Focuses light onto the retina

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4
Q

What is the function of the optic nerve?

A

A bundle of sensory neutrons that carry impulses to the brain

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5
Q

What is the function of the retina?

A

Layers of tissue that contain photoreceptor cells called rods and cones

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6
Q

What is the function of the fovea

A

Area of the retina with the highest concentration of cone cells that provides sharp vision

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7
Q

What is the function of the aqueous humour

A

Maintains pressure in the eye and nourishes cornea

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8
Q

What is the function of the vitreous humour

A

Maintains the shape of the eye and attaches to the retina

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9
Q

What is the function of the ciliary muscles ?

A

Help change the shape of the lens in accommodation

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10
Q

What is the function of the sclera?

A

Tough outer layer that extraoculular muscles can attach to

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11
Q

What is the function of the pupil

A

Hole in centre of eye to let light in

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12
Q

What light do rods work in

A

Dim light but they can only see black and white

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13
Q

What light can comes work in

A

Bright light

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14
Q

What are the three types of cone cells

A

Red green blue

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15
Q

How do we see lol

A

The image is refracted by the cornea and then the lense

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16
Q

How does the iris change the shape of the pupil?

A

Using circular and radial muscles

17
Q

Why does the iris change the shape of the pupil

A

To control the amount of light entering the eye

18
Q

What do the circular muscles do in bright light ?

A

Contract making the pupils constrict

19
Q

What do the radial muscles do in bright light ?

A

Relax so the pupils constrict

20
Q

What do the circular muscles do in dim light?

A

Relax so the pupils dilate

21
Q

What do the radial muscles do in dim light ?

A

Contract so the pupils dilate

22
Q

How do eyes focus

A

By accommodation

- changing shape of lens

23
Q

What controls accommodation,

A

Ciliary muscles and suspensory ligaments

24
Q

What happens when focusing on a distant object?

A

Ciliary muscles relax
Susp ligs tighten
Lens is pulled thin

25
Q

What happens when focusing on a close object?

A

Ciliary muscles contract
Susp ligs slacken
Lens becomes fatter

Biologigogoyl (13 decks)

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