The eye

Question 1

What’s the Scalera?

Answer 1

The tough supporting wall of the eye

Question 2

What’s the cornea?

Answer 2

The transparent outer layer found at the front of the eye

Question 3

What’s the iris?

Answer 3

It contains muscles that control the diameter of the eye
.Therefore it controls the amount of light that enters the eye

Question 4

What’s the lens?

Answer 4

It focuses light onto the retina

Question 5

What’s the retina?

Answer 5

Contains receptor cells sensitive to light and colour

Question 6

What are cone cells?

Answer 6

Light sensitive cells that detect colour
.They are found in the retina

Question 7

What are rod cells?

Answer 7

Extremely light sensitive cells, that helps us see in the dark
.Can only detect black and white
.Why we can only see black and white in the dark

Question 8

What do the ciliary muscles and suspensory ligaments do?

Answer 8

Control the shape of the eye

Question 9

What’s the optic nerve?

Answer 9

carries impulses from receptors to the brain

Question 10

How does the iris react to bright light?

Answer 10

1)The circular muscles contract and the radical muscles relax
2)This causes the pupil to get smaller(constricts)
3)This reflex protects your light sensitive cells at the back of your eye, from getting damaged

Question 11

How does the iris react to dim light?

Answer 11

1)The circular muscles relax and the radical muscles contract
2)This makes the pupil wider(the pupil dilates) which allows for more light to enter the eye
3)This allows for more light to reach the light sensitive rod cells at the back of the eye

Question 12

What is the process called- when the eye focuses light on the retina by changing the shape of the lens?

Answer 12

Accomodation

Question 13

What’s the process in the eye, when looking at objects near by?

Answer 13

1)The ciliary muscles contract and the suspensory ligaments slacken(relax)
2)The lens becomes more curved
3)This increases the amount of light refracted

Question 14

What’s the process in the eye, when looking at distant objects?

Answer 14

1)The ciliary muscles relax and the suspensory ligaments contract
2)The lens becomes thinner(less curved)
3)This means your eye refracts a smaller amount of light

Question 15

What are some causes of long sightedness?

Answer 15

The eyeball is to short
The eye doesn’t refract light enough
The lens could be the wrong shape

Question 16

What are some treatments for long sightedness?

Answer 16

Glasses with convex lenses (curved outwards)
.Laser eye surgery
.Replacement lens surgery

Question 17

What are some causes of short sightedness?

Answer 17

The eyeball is to long
The lens is the wrong shape
The eye refracts to much light

Question 18

What are some treatments for short sightedness?

Answer 18

Glasses with concave lenses (curve inwards)
Laser eye surgery

Question 19

What’s the medical name for long sightedness?

Answer 19

hyperopia

Question 20

What’s the medical name for short sightedness?

Answer 20

myopia

Question 21

What happens that results in long sightedness?

Answer 21

The images of nearby objects are brought into focus behind the retina

Question 22

What happens that results in short sightedness?

Answer 22

The images of distant objects are brought into focus in front of the retina