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CCMA: Lesson 9: The Special Senses: The Eyes and Ears > Chapter 3: Structures of the Eyes > Flashcards

Chapter 3: Structures of the Eyes Flashcards

1
Q

The human eyeball sits in a protective, bony cavity called?

A

The orbit.

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2
Q

What does the eyelids and eyelashes protect?

A

The eye tissues.

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3
Q

Why does the blinking spreads a film of tears over the eyeball’s exposure surface?

A

To protect and lubricate the eye and sweep debris away.

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4
Q

What is The Conjunctiva?

A

A clear, thin mucous membrane that covers the inner surface of the eyelids and the back and sides of the eye’s outer surface.

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5
Q

What does The Conjunctiva do?

A

Keep the front surface of the eye moist and lubricated.

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6
Q

Why does The Conjunctiva keep the inner surface of the eyelids moist and lubricated?

A

So they open and close easily without friction or causing eye irritation.

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7
Q

What does the Conjunctiva protect the eye from?

A

From dust, debris and infection-causing microorganism.

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8
Q

What are the three layers that made up The Wall of the Eyelid?

A

Sclera, Choroid and Retina.

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9
Q

What is The Sclera?

A

The tough outer tissue that protects the entire eyeball.

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10
Q

The Sclera is also known as?

A

The White of the eye.

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11
Q

What is The Choroid?

A

The middle layer of the eye that contains the blood vessels that nourish the eye.

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12
Q

What is The Retina?

A

The innermost layer of light-sensitive tissue that lines the back of the eye.

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13
Q

The Retina converts light into what?

A

Into electrical impulses that travel through the optic nerve to the brain which interprets them as images.

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14
Q

The front one-third of the eye is divided into what?

A

Two chambers.

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15
Q

What is the Anterior chamber?

A

The front part of the eye between the cornea and the lens.

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16
Q

What is the Posterior Chamber?

A

Is between the iris and lens.

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17
Q

What fills most of the inside of the eye?

A

Fluid.

18
Q

What are the chambers in front of the lens (anterior and posterior chambers) filled with?

A

With a clear, watery fluid called aqueous humor.

19
Q

What does the large space behind the lens contain?

A

A thick, gel-like fluid called vitreous humor.

20
Q

What are the two fluids that press against the inside of the eyeball and help it keep its shape?

A

Aqueous humor and Vitreous humor.

21
Q

What is the Cornea?

A

A transparent, dome-shaped membrane.

22
Q

Where is the Cornea located?

A

At the center of the front of the eye.

23
Q

If the Cornea has no blood supply, from where does it obtains its nutrients?

A

From tears and from fluid in the anterior chamber behind it.

24
Q

The cornea plays a key role in vision by helping what?

A

Focus the light that comes into the eye on the retina.

25
Q

What happens if the image is not focused properly?

A

The retina makes a blurry image.

26
Q

What screens out damaging ultraviolet (UV) light from the sun?

A

The cornea.

27
Q

What protects the lens and retina from injury due to UV rays.

A

The Cornea.

28
Q

What is the Iris?

A

The colored part of the eye.

29
Q

What determines eye color?

A

Pigmentation in the front layers.

30
Q

What does the eyes need to see properly?

A

The correct amount of light.

31
Q

What is the primary job of the iris?

A

To regulate how much light enters the eye.

32
Q

What controls how much light enters the eye?

A

The muscles in the iris.

33
Q

During the day less light is needed and in darker conditions that does the eye do to see things clearly?

A

The eye will try to let in more light to see.

34
Q

What is the Pupil?

A

The black opening in the center of the iris through which light enters the eye.

35
Q

How does the muscles of the iris work?

A

They either contract or enlarge the pupil depending on the level of light.

36
Q

What happens when bright light comes to the eye?

A

The pupil will contract.

37
Q

What happens when there is no much light coming to the eye?

A

The pupil will enlarge to let in more light.

38
Q

What are the Lens?

A

The clear part of the eye behind the iris.

39
Q

what does the Lens do?

A

Helps to focus light on the retina, which then relays nerve impulses to the brain.

40
Q

Why does the lens adjusts the eye’s focus?

A

To allow us to see clear up close or far away.

41
Q

The ability of the lens to bend light rays so they focus on the retina is known as?

A

Refraction.

42
Q

What does the Lens provides?

A

A fine-tuning adjustment to the primary focusing structure of the eye, the cornea.

CCMA: Lesson 9: The Special Senses: The Eyes and Ears (17 decks)

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