Unit 1 - Photoreception

Question 1

Sclera

Answer 1

Tough, white, fibrous protective layer.

Question 2

Cornea

Answer 2

Transparent portion of sclera, where light enters, refracts (bends) light rays.

Question 3

Choroid

Answer 3

Contains blood vessels supplying cells of the eye.

Question 4

Iris

Answer 4

Coloured part of the eye.

Question 5

Pupil

Answer 5

In the centre of the IRIS. Iris constricts/dilated to control size of pupil.

Question 6

Lens

Answer 6

Refracts light to focus image.

Question 7

Ciliary Muscles

Answer 7

Contract/relax to change shape of lens to change focal distance.

Question 8

Retina

Answer 8

Contains photoreceptors (Rods & Cones).

Question 9

Rods

Answer 9

Black & White / night vision.

Question 10

Cones

Answer 10

Colour Vision, fine details.

Question 11

Aqueous & Vitreous Humour

Answer 11

Maintain eye shape. Also provides nutrients to some cells & refract light.

Question 12

Accommodation

Answer 12

Far Away Objects: Ciliary muscles relax, lens flatten.
Near Objects: Ciliary muscles contract, lens becomes rounded.

Question 13

Signal

Answer 13

Photoreceptors –> Optic Nerve –> Thalamus –> Occipital lobe.

–>Info from left eye goes to right occipital lobe.
–> Info from right eye goes to left occipital lobe.

Question 14

Blind Spot

Answer 14

Where optic nerves connects to the retina, no photoreceptors.
–> BINOCULAR VISION: each eye convers the blind spot for the other eye.