An
eye work like a camera that takes pictures of the world around
us.Without them,it would become very difficult for us ,to do even a
small task.When we look at an object,Light rays enter through the
pupil.A colored part in an eye, called Iris ,controls the amount
of light entering into the eyes.When the light falls on a curved
transparent lens of the eye,it bends the light so that a clear
picture is formed at the back of the eye on the area called retina.As
our vision changes our brain makes a series of pictures,hundreds of
times a second.The nerves in the brain make a sense of the
pictures-like changes in colour,finding edges,recognizing shades and
recognizing shapes of the objects.There are three types of the
objects.There are three types of colour sensitive cells in our eyes that
recognize red ,blue and green.All other colors are formed with the
combination of these colors.The average person blinks 12 times a
minute.
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