The Eye

Question 1

Retina

Answer 1

Light sensitive cell layer
made of rod (light intensity)
and cone (red, green, blue
colour perception) cells

Question 2

Optic Nerve

Answer 2

Carries impulses to brain

Question 3

Cornea

Answer 3

Transparent layer that covers the pupil and iris

Question 4

Iris

Answer 4

Controls size of pupil and
the amount of light let in
the eyes

Question 5

Lens

Answer 5

Changes thickness to
refract and focus light onto
the retina.

Question 6

Hyperopia (long sightedness)

Answer 6

Lens can not be made thick enough. Treated
using a convex lens so the light is focused on the retina.

Question 7

Myopia (short sightedness)

Answer 7

Lens too thick. Treated using a concave lens so
light is focused on the retina.

Question 8

Cataracts

Answer 8

caused by protein build up in the lens blocking light entering the eye. They can be removed with surgery and an artificial lens insert

Question 9

Colour blindness

Answer 9

when cones in the retina do not work properly and some colours cannot be detected.