Eye

Question 1

What causes cataracts?

Answer 1

Protein build up which causes clouding in the lens

Question 2

How do we treat astigmatism?

Answer 2

Corrective lenses

Question 3

What causes astigmatism

Answer 3

Inherited
Injury

Question 4

What contains ciliary muscles?

Answer 4

The ciliary body

Question 5

What is the function of the shape sort ligaments?

Answer 5

Controls the thickness of the lens

Question 6

What are the suspensory ligaments attached to?

Answer 6

Lens

Question 7

Pupil:

Answer 7

The hole in the eye that changes size due to the iris

Question 8

What contains pain receptors?

Answer 8

The cornea

Question 9

Where is the site of highest light refraction?

Answer 9

The cornea

Question 10

What does the cornea cover?

Answer 10

The front area of the eye

Question 11

What part is responsible for the pupillary mechanism?

Answer 11

The iris

Question 12

Iris:

Answer 12

Radial and circular muscles

Question 13

Which structure of the eye is responsible for how much light enters the eye?

Answer 13

Iris

Question 14

The function of the lens is to:

Answer 14

Refract and focus light into the retina

Question 15

What two characteristics about the lens allows it to do it’s function?

Answer 15

Flexible
Transparent

Question 16

The function of the choroid is to:

Answer 16

Provide nutrients to the eye and absorb excessive light

Question 17

Which layer of the eye is filled with blood vessels?

Answer 17

The choroid

Question 18

Where is the blind spot created?

Answer 18

Where the optic nerve leaves the eye

Question 19

Area of the retina where there are no rods or cones

Answer 19

Blind spot

Question 20

Which area of the retina produces the highest focus?

Answer 20

Fovea (yellow spot)

Question 21

What are rods for?

Answer 21

Black and white vision

Question 22

What are cones for?

Answer 22

Colour vision

Question 23

The receptors of the eye are the:

Answer 23

Rods and cones

Question 24

Function of the sclera:

Answer 24

Protects and maintains the shape of the eye

Question 25

Function of conjunctiva:

Answer 25

Protection

Question 26

Sclera:

Answer 26

White, fibrous layer of the eye

Question 27

Distant vision:

Answer 27

> 6m
Ciliary muscles contracts
Suspensory ligaments slacken
Lens becomes more convex
Refraction increases
Clear image formed on retina

Question 28

Bright light:

Answer 28

Radial muscles relax
Circular muscles contract
Pupil reduces
Less light let into the eye

Question 29

Dim light:

Answer 29

Radial muscles contract
Circular muscles relax
Pupils dilate
More light let into the eye

Question 30

Cataracts:

Answer 30

Cause: old age where proteins in the eye clump together resulting in clouding of the lens where less light enters the eye
Treatment: surgery to remove hardened cloudy layer above eye

Question 31

Astigmatism

Answer 31

Causes: hereditary but can be caused by injury; irregularly shapes lens or cornea
Treatment: corrective lenses

Question 32

Hypermetropia

Answer 32

When you can see far away but not close up
Eye is too short
The cornea of the lens is too flat
Light rays meet behind the retina
Solution: wear convex lenses

Question 33

Myopia:

Answer 33

Can see close but not far
Eyeball is too long
Cornea or lens is too convex
Light rays meet in front of the retina
Solution: wear concave lenses

Question 34

What visual defect is when you can see close up but not far?

Answer 34

Myopia

Question 35

What visual defect is when you can see far away but not close up?

Answer 35

Hypermetropia