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GR9Finished Studying7 Science > The Eye > Flashcards

The Eye Flashcards

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Biology 101 flashcards
1
Q

What is the stimulus?

A

Light.

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2
Q

What is the receiver?

A

Eye.

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3
Q

What is the transformer?

A

Retina.

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4
Q

What is the conductor?

A

Optic Nerve.

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5
Q

What is the analyzer?

A

Brain.

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6
Q

Light behaves as 2 things? Name them.

A

1-Particles (photons)

2-waves (electromagnetic waves)

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7
Q

Do all waves pass through a medium?

A

Not all of them but yes some of them. The sun is an example of a wave that doesn’t pass through a medium.

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8
Q

What is the cornea?

A

The transparent part that bulges in front of the iris and pupil and is the continuity of the sclera.

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9
Q

What does the cornea do?

A

It allows light to go into the eye.

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10
Q

What is the aqueous humour?

A

A jelly in between the cornea and the iris.

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11
Q

What does the aqueous humour do?

A

It maintains a constant pressure in the eye and allows light through.

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12
Q

What is the iris?

A

The coloured part of the eye.

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13
Q

What does the iris do?

A

It adjusts the amount of light going on the retina.

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14
Q

What does the iris do when theres more light?

A

It opens up, (expands outwards and becomes bigger).

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15
Q

What is the pupil?

A

The hole in the eye.

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16
Q

What does the pupil do?

A

It allows light through.

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17
Q

What is the lens?

A

It contracts and extends depending on the distance of the object t focus on it.

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18
Q

What does the lens do?

A

It flips the light and focuses it on the retina.

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19
Q

What is the vitreous humour?

A

A jelly in between the lens and the retina.

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20
Q

What does the vitreous humour do?

A

It allows light through.

21
Q

What is the retina?

A

Its where the light/image focuses on.

22
Q

What light sensitive highly specialized cells are on the retina?

A

Rods and cones.

23
Q

What are rods and cones?

A

The receptors/transformer.

24
Q

What do rods and cones do?

A

They transform light and images into nerve impulses.

25
Q

What is the choroid?

A

Its the continued part of the iris.

26
Q

Describe the choroid. (2 things)

A

1-Under/behind the retina

2-Black

27
Q

What is the choroid made up of?

A

Blood vessels that supply nutrients and oxygen to the eye.

28
Q

What is the sclera?

A

The white tough surface of the eye except the cornea.

29
Q

What does the sclera do?

A

It protects the eye from major impacts.

30
Q

What is the optic nerve?

A

A wire like thing that sends the nerve impulses to the brain.

31
Q

Where is the blind spot?

A

Its where the optic nerve begins.

32
Q

Where is the fovea?

A

The back and center of the retina.

33
Q

The ____ half of the field of vision is perceived by the right cerebral hemisphere.

A

Left.

34
Q

What is refraction?

A

It’s when light travels at different speeds through different media.

35
Q

Depending on the type of lens, what happens to the light when it goes through the lens?

A

It is bent.

36
Q

In a normal eye where is the image/light focused?

A

On the retina.

37
Q

How do we see?

A

The image/light gets flipped onto the retina when it goes through the lens, then gets flipped back upright by our brain.

38
Q

Whats the scientific term for nearsightedness?

A

Myopia

39
Q

Whats the scientific term for farsightedness?

A

Hyperopia

40
Q

Myopic people can see______.

A

Near

41
Q

Farsighted people can see_____.

A

Far

42
Q

Myopia: The light focuses too near so the image is formed where?

A

In front of the retina.

43
Q

Myopia: Why is the image in front of the retina? (Name 3 things)

A

The eyeball is too long, the lens is too thick, or strong ciliary muscles.

44
Q

How can you correct the vision of a myopic person?

A

A concave lens.

45
Q

Hyperopia: The light focuses too far so the image is formed where?

A

Behind the retina.

46
Q

Hyperopia: Why is the image behind the retina? (Name 3 things)

A

The eyeball is too short, the lens is too thin, or weak ciliary muscles.

47
Q

How can you correct the vision of a farsighted person?

A

A convex lens.

48
Q

What is presbyopia?

A

The same as hyperopia except its due to aging.

49
Q

What happens with presbyopia?

A

The lens loses its elasticity and cant bend the light as much therefore it focuses beyond the retina.

GR9Finished Studying7 Science (7 decks)

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