Biology - Human eye parts

The Eye

Is an organ of the body specialized for sight or visual system.

Sclera

This is a tough white layer that protects the eyeball.

Cornea

This is the transparent layer at the front of the eye that refracts the light entering to focus it.

Choroid

Produces black pigment to prevent reflection of light inside the eye.

Retina

A light sensitive layer made up of rods and cones.

Blind spot

Part of the retina in front of the optic nerve that lacks rods or cones.

Optic nerve

Transmits electrical impulses from the retina to the brain.

Vitreous humour

Transparent, viscous liquid that maintains the shape of the eyeball.

Aqueous humour

It is a watery fluid which supports the cornea and keeps it in shape.

Ciliary body

A ring of muscle that controls the shape of the lens to allow focussing.

Iris

A coloured ring of circular and radial muscle that controls the size of the pupil.

Suspensory ligament

Attaches the lens to the ciliary body, so the lens is held in place.

Pupil

A hole in the centre of the iris that controls the amount of light reaching the retina.

Lens

A transparent, convex, flexible, jelly - like structure that reflects light to focus it.

Fovea

An area of the retina containing a high concentration of cones , where light is usually focused and colours are detected.

Conjuctiva

A transparent, sensitive layer on the surface of the cornea.