Control of light intensity entering the eye

Biology

STRUCTURE AND FUNCTION OF PARTS OF THE HUMAN EYE

STRUCTURE AND FUNCTION OF PARTS OF THE HUMAN EYE.

Structure.

The human eye is spherical in shape and situated within a socket or orbit in the skull.
It is attached to the skull by three pairs of muscle, which also control its movement.
It is made up of three main layers; sclerotic layer, choroid and the light sensitive retina.

Sclerotic layer

Outermost white part situated at the sides and back of the eye.
Made up of collagen fibres.
It protects the eye and gives its shape.