Question

Mention the function of the following : 1) Iris 2) Ciliary muscles 3) Retina 4) Eye lens

Answer 1

IRIS Give COLOUR TO OUR EYE. Retina FORM IMEAGE. CILIARY Muscle Control SIZE OF LENSE . LENSE Adjust Focal Length T O FORM IMAGE

Answer 2

The iris regulates the size of the pupil which controls how much light is allowed to enter the eye.

Cornea This is the front part of the tough outer coat that is transparent. It refracts light (bends it as it enters the eyes to ensure it is in the right place).

Lens A transparent, biconvex, flexible disc behind the iris. Focuses the light onto the retina ( the light sensitive part of the eye),

Retina The lining of the back of the eye containing two types of photoreceptor cells - Rods (sensitive to dim light, black and white) and Cones (sensitive to colour). This detects the light in the way a film would in a camera.