Eye

Question 1

How does the human eye see light

Answer 1

Light passes through the cornea that bends light to help it focus
Light enters the pupil
Iris controls how much light is let in by the pupil
Light passes through the lens which focuses light on the retina
Light hits retina
Photoreceptors turn light into electrical signals
Signals travel to the optic nerve in the brain
Brain interprets theses signals into the image we see

Question 2

What is short sightedness called

Answer 2

Myopia

Question 3

Define Myopia

Answer 3

Where the distance between the lens and retina is too far (long eye) and light is focused in front of the retina (Lens in too thick and curved)

Question 4

Effects of Myopia

Answer 4

Cant see distant objects

Question 5

Solutions for Myopia

Answer 5

Concave/ diverging lens which pushes the rays of light further apart so that they arrive together in proper focus at the back of the eye.

Question 6

Define Hypermetropia

Answer 6

Where the distance between the lens and retina is too small (short eye) and he lens cannot thicken to focus light (Loss of elasticity in the lens).

Question 7

Effects of Hypermetropia

Answer 7

Cannot see near objects

Question 8

Cures for Hypermetropia

Answer 8

Convex / converging lens which increases refraction and reduces the focus length

Question 9

With myopia, is the focus point too far or too close

Answer 9

Too close (light focuses in front of the retina)

Question 10

With hypermetropia, is the focus point too far or too close

Answer 10

Too far (light focuses behind the retina)

Question 11

Choroid function

Answer 11

supplies the outer retina with nutrients, and maintains the temperature and volume of the eye.

Question 12

Retina Function

Answer 12

captures incoming photons and transmits them along neuronal pathways as signals for the brain to interpret.

Question 13

Vitreous Humour function

Answer 13

provide nutrients to the lens, causing eye growth and providing support to the retina

Question 14

Sclera function

Answer 14

The white outer coating of the eye that supports and maintains the eyeball’s shape, and protects it from injury.

Question 15

Cornea function

Answer 15

A transparent layer in the front of the eye which provides a barrier against eye infections, allows refraction of light and focusing of light.

Question 16

Pupil function

Answer 16

Regulates the flow of light to the retina and changes size to let more or less light in (smaller in brightness) (bigger in darkness)

Question 17

Iris function

Answer 17

Coloured tissue which determines eye colour and controls how much light the pupil lets in

Question 18

Lens function

Answer 18

A clear, curved disk that sits behind the iris and in front of the vitreous. It transmits light and focuses it onto the retina

Question 19

Optic nerve function

Answer 19

Transmits electrical signals from your eyes to the brain. Your brain processes this sensory information so that you can see

Question 20

Describe the blind spot

Answer 20

Where the optic nerve passes through the retina, no photoreceptors are there to detect light. Located where the optic nerve connects to the retina

Question 21

Aqueous humour

Answer 21

Clear fluid filling the space in the front of the eyeball between the lens and cornea
It provides nutrition to the eye and maintains pressure within the eye

Question 22

Where is the blind spot located

Answer 22

Where the optic nerve connects to the retina