The eye

Question 1

What is the Cornea + function

Answer 1

The front part of the tough outer coat, the sclera, convex, transparent. Refracts light/ bends it as it enters the eye

Question 2

What is the Iris + function

Answer 2

Pigmented - light cant pass through - muscles contract to alter size of pupil which controls how much light enters the pupil.

Question 3

What is the lens + function

Answer 3

Flexible disc behind the iris attached by the suspensory ligaments to the ciliary muscles. Focuses light onto the retina

Question 4

What is the retina + function

Answer 4

The lining of the back of the eye: photoreceptor cells - rods - sensitive to dim light + black + white - and cones - sensitive to colours. Contains the light receptors

Question 5

What is the optic nerve + function

Answer 5

Bundle of the sensory neurones at the back of eye. Carries impulses from the eye to the brain.