The Eye

Question 1

Function of the iris

Answer 1

Colored based of the eye & makes the pupil contract and relax

Question 2

Function of the lens

Answer 2

Changes shape & reflects light (like cornea)

Question 3

Function of the optical nerve

Answer 3

Takes impulses to the brain

Question 4

Function of the pupil

Answer 4

Allows light through for the lens

Question 5

Function of the cornea(3)

Answer 5

Is transparent
No blood vessels(oxygen diffuses in the eye)
Reflects light

Question 6

Function of the retina

Answer 6

It’s made out of the cone cells which show color, and the rod cells which show black&white.

Question 7

Function of the fovea

Answer 7

Consists of cone cells (sensitive)

Question 8

Explain what happens to the eye in dim light

Answer 8

Radial muscles CONTRACT and Circular muscles RELAX. Pupil DILATES to allow entry of light

Question 9

Explain what happens when the eye is exposed to bright light

Answer 9

Radial muscles RELAX & Circular muscles CONTRACT. Pupil constricts to reduce light entry

Question 10

Explain accommodation

Answer 10

The function of the eye focusing on near&distant objects to the retina. The way the lens brings about fine focusing.

Question 11

Ecplainwhat happens when looking at a distant object

Answer 11

The light that enters the eye mustbebentless. Lens has to thin and elongate to refract light less bent. Ciliary muscles &sensory ligaments change thickens