Eye Components

Question 1

Sclera

Answer 1

Tough, white outer covering of the eyeball which is continuous with the cornea.

Question 2

Lens

Answer 2

Transparent, circular and biconvex structures which changes its shape or thickness in order to refract light into the retina.

Question 3

Cilliary body

Answer 3

Contains cilliary muscles which control the curvature and thickness of the lens.

Question 4

Suspensory Ligament

Answer 4

Attaches the edge of the lens to the cilliary body.

Question 5

Choroid

Answer 5

Black pigmented middle layer of the eyeball the prevent the internal refraction of light. Contains blood vessels that carry oxygen and nutrients to eyeball while removing metabolic waste products.

Question 6

Vtireous chamber

Answer 6

The space behind the lens which is filled with vitreous humour, a transparent watery fluid. Vitreous humour keeps the eyeball firm and refracts light onto the retina

Question 7

Blind spot

Answer 7

The region where the optic nerve leaves the eye. Does not contain rods or cones, therefore not sensitive to light.

Question 8

Retina

Answer 8

Contains light sensitive cells known as photoreceptors, which consist of rods and cones.

Question 9

Fovea

Answer 9

A small yellow depression where images are focused. Contains cones but not rods.

Question 10

Optic nerve

Answer 10

Nerve that transmits nerve impulses to the brain upon stimulation of the photoreceptors.

Question 11

Rods

Answer 11

1. Allow us to see in dim light, but only in black and white.
2. Contain a pigment called visual purple. Visual purple gets bleached when exposed to bright light and impulses cannot be sent to the brain.

Question 12

Cones

Answer 12

1. Enable us to see colours in bright light.