The Eye

Question 1

List all the parts of the eye

Answer 1

Cornea
Iris
Lens
Pupil
Optic Nerve
Retina
Ciliary Muscles
Suspensory ligament
Sclera

Question 2

What is the structure and function of the cornea?

Answer 2

• Transparent layer covering the eye
• Refracts light by a certain amount

Question 3

What is the function of the lens?

Answer 3

• It can change it’s size to focus on near and far objects
  -focus the light ray to the retina

Question 4

What is the function of the pupil?

Answer 4

The gap between the iris which allows light to pass through

Question 5

What is the structure and function of the Iris?

Answer 5

-The colour part of the eye
-Controls the size of the pupil

Question 6

Which 2 fibre controls the size of the lens?

Answer 6

Suspensory ligament
Ciliary muscles

Question 7

What is the Sclera?

Answer 7

The tough outer layer of the eye

Question 8

What is the function of the optic nerve?

Answer 8

It carries signals to the brain from the retina

Question 9

What is the meaning of accomodation?

Answer 9

The ability to change the lens to focus on the near and far object

Question 10

What happens to your eye when it’s focused to near objects?

Answer 10

The ciliary muscles contracts and the suspensory ligaments loosen to make to lens short and fat

Question 11

What happens to your eye when it’s focused to far objects?

Answer 11

The ciliary muscles relax and the suspensory ligament tighten to make the lens long and thin.

Question 12

What’s the technical term for longsightedness and what does it do?

Answer 12

Hyperopia
You can focus on distanced object but not near object

Question 13

What’s the technical term for shortsightedness and what does it do?

Answer 13

Myopia
You can focus on near objects but not far objects

Question 14

What are the new technologies that can help with myopia and hyperopia?

Answer 14

-Contact lenses
-Procedure which changes the shape of your cornea to make it refract more or less light
-artificial lens

Question 15

What is the Iris Reflex?

Answer 15

A rapid and automatic response that regulates the amount of light entering the eye by adjusting the size of the pupil

Question 16

What happens to my eye when the the light is turned on suddenly

Answer 16

1. The receptors on the eye detected a change of the light intensity
2. A nerve impulse is sent along the sensory neuron and to the brain
3. A signal is then sent from the brain along the motor neuron to the circular muscle and radial muscle ( iris muscles )
4. The circular muscle contracts and the radial muscles relax, making the iris constrict, letting less light in.