eye parts and functions

Iris

Controls size of pupil according to amount of light and gives eyes their colour.

Vitrious humor

Fills up eye behind lens with it's jelly like tissue that helps maintain the shape of the eye.

Lens

Helps to focus an image on the retina

Pupil

Hole in iris that allows light to pass through

Sclerotic layer

Tough white outer layer that protects the eye and helps maintain its shape.

Choroid layer

a black layer lining behind the retina . It prevents light from reflecting all around the eye and nourishes it with blood and oxygen.

Conjuctiva

a clear thin layer covering the front of the eye. An infection of the eye called conjunctivitis can occur here.

Retina

a layer containing light-sensitive cells where image is produced and changed into nerve signals

Yellow spot (fovea)

a section of the retina directly behind the pupil that contains a large number of the colour-sensitive cells.

optic nerve

carries nerve signals to brain

Cilliary mucles

change the shape of the lens to bring images into focus.

Suspensory ligaments

holds the lens in place.

Cornea

thin clear layer at surface of eye that Helps to focus light on the retina

Aqueous humor

watery liquid that fills the space between the cornea and the lens. Helps maintain the shape of the eye.

Blind spot

where blood vessels and optic nerve join the eyeball. There are no light-sensitive cells to detect image information.