the human eye is nearly spherical in shape(eye ball)with a diameter of about 2.5cm.light enters the eye thought a curved(tough)front surface.this is know as the cornea of the eye which is whitish in colour.do you know??animals have eyes shaped in different ways.eyes of crab are quite small whereas butterflies have large eyes that seem to be made up of thousand of little eyes.they can see not only in front and side but towards the back as well._CARE OF EYES_-(1)have a regular check up.if so advised,use the correct spectacles.(2)never look at the sun ,or any other powerful light objects directly.