WHAT IS EACH PART IRIS: is the coloured part of the eye, around the pupil. It’s made of muscle fibres that open and close the pupil. PUPIL: is a small hole that lets light into the eye. LENS: is behind the pupil and the iris. If focouses light on the retina.
RETINA: has got a thin layer of optic cells that detect light and colours. These optic cells send information to the optic nerve. CORNEA: is a transparent layer of cells. It covers and protects the iris and the pupil.
HOW THE EYE WORKS 1: Light goes into the eye through the pupil. Then it passes through the lens. 2: The lens projects an upside down image onto the retina. The optic cells in the retina detect the light and colour. Then they send nerve impulses to the optic nerve. 3: The optic nerve transmit the nerve impulses to the brain. Finally, the brain interprets the impulses. It also turns the image the right way up again.