CORNEA – The transparent layer which covers the iris and pupil. It also refracts the light on to the retina.
IRIS AND PUPIL – The Iris is the coloured part of the eye which lies behind the cornea. The colour of the iris is determined by the amount and type of pigment. The pupil which is a hole within the centre of the iris acts to let light into the eye. In dark conditions the pupil expands to let more light through and in bright conditions the pupil constricts to reduce the amount of light entering the eye.
LENS – The crystalline lens is a biconvex structure and sits just behind the iris. The lens allows the light an unimpeded path to the retina and also refracts the light onto the retina. The cornea and the lens form the the eye’s “camera”.
SCLERA – The sclera also know as “the white of the eye”. It forms the supporting wall of the eyeball and is continuous with the transparent cornea.
RETINA – The light sensitive layer, containing rods and cones. Light is focused onto the retina which initiates a series of chemical and electrical events.
OPTIC NERVE – This is made up of many nerve fibres and connects the eye to the brain. The chemical and electrical signals produced by the retina are carried by the optic nerve to the brain