Parts Of The Eye

Question 0

Iris

Answer 0

A coloured circular muscle which contracts and expands to change the size of the pupil

Question 1

Pupil

Answer 1

Adjustable opening in the centre of the eyes iris through which lights enters

Question 2

Lens

Answer 2

A transparent structure located behind the iris that changes shape to focus light into an image

Question 3

Ciliary muscles

Answer 3

Muscles attached to each end of the lens that contract or relax to change the shape of the lens so it can focus light images of objects far away

Question 4

Retina

Answer 4

Light sensitive membrane composed of a number of layers of specialised Neurons at the back of the eye

Question 5

Photoreceptors

Answer 5

Receptor cells located at the back of the retina used to detect light

Question 6

Axon

Answer 6

Fibre that carries information away from the cell body of a neuron

Question 7

Optic nerve

Answer 7

The nerve that connects the eye to the brain

Question 8

Blind spot

Answer 8

The opening on the retina through which the optic nerve exits to brain

Question 9

Occipital lobe

Answer 9

The brain area that receives and processes visual stimuli

Question 10

Cones

Answer 10

Photoreceptors that detect bright light. Responsible for day vision, color vision and visual acuity

Question 11

Rods

Answer 11

Photoreceptors that detect dim light. Responsible for night vision, black and white and peripheral vision

Question 12

Visual acuity

Answer 12

Sharpness of vision and ability to detect fine detail

Question 13

Fovea

Answer 13

Cup shaped area in the middle of the retina containing cones

Question 14

Peripheral vision

Answer 14

Vision at the sides of the visual field

Question 15

Visual field

Answer 15

All the area of the environment that can be seen when your head is still