Bio - The Eye

Question 1

What is the function of the sclera

Answer 1

It’s the tough supporting wall of the eye

Question 2

What is the function of the cornea

Answer 2

It’s the transparent outer layer at the front of the eye and refracts light into it

Question 3

What is the function of the iris

Answer 3

Contains muscles which allow it to control the diameter of the pupil

Question 4

What is the function of the lense

Answer 4

To focus light onto the retina

Question 5

What is the function of the ciliary muscles and suspensory ligaments

Answer 5

To control the shape of the lense

Question 6

What’s the function of the optic nerve

Answer 6

To carry impulses from the receptors in the retina to the brain

Question 7

Why must the pupil become smaller in bright light?

Answer 7

To protect the retina

Question 8

What muscles when contracted make the pupil smaller

Answer 8

The circular muscles

Question 9

What muscles when contacted widen the eye

Answer 9

Radial muscles

Question 10

When looking at a near object…

Answer 10

Ciliary muscles contract slackening the suspensory ligaments and making the lens become fat increasing the amount it refracts light

Question 11

When looking at a distant object…

Answer 11

Ciliary muscles relax allowing suspensory ligaments to pull tight and makes the lens go thin so it refracts light a smaller amount

Question 12

How does long sightedness happen?

Answer 12

1. The lens is the wrong shape and doesn’t refract the light enough
2. The eyeball is too short

Question 13

Where does the image form in long sightedness

Answer 13

Behind the retina

Question 14

Where does the image form in short sightedness

Answer 14

In front of the retina

Question 15

How does short sightedness happen

Answer 15

1. The lens is the wrong shape and refracts light too much

2. The eyeball is too long

Question 16

What’s the medical term for long sightedness

Answer 16

Hyperopia

Question 17

What’s the medical term for short sightedness

Answer 17

Myopia

Question 18

What sort of lens can correct long sightedness

Answer 18

A convex lens (bulgy) looks like ()

Question 19

What sort of lens can correct short sightedness

Answer 19

A concave lens (bendy) looks like )(

Question 20

What are three alternatives to glasses

Answer 20

1. Contact lenses
2. Laser eye surgery
3. Replacement lens surgery

Question 21

One advantage to contact lenses

Answer 21

They’re lightweight and almost invisible

Question 22

One disadvantage to contact lenses

Answer 22

Eye infections

Question 23

How does laser eye surgery work

Answer 23

Vaporises tissue from the cornea

Question 24

Disadvantage to laser eye surgery

Answer 24

There’s always a risk of complications

Question 25

Advantages to laser eye surgery

Answer 25

It’s permanent

Question 26

What does slimming down the cornea do

Answer 26

Makes it less powerful and improve vision for short sighted people

Question 27

What would changing the shape of the cornea do

Answer 27

Make it more powerful which improves vision for long sighted people

Question 28

How is replacement lens surgery done

Answer 28

The faulty lens is replaced by an artificial one made of plastic

Question 29

What’s a disadvantage to replacement lens surgery

Answer 29

Has higher risks than laser eye surgery and could damage the retina