Your eyes and vision are a remarkable part of your daily life. As you live, work and move through your daily routines, your eyes must change focus thousands of times. In order to accommodate the differences in lighting and the closeness or distance of objects you are observing, your eyes constantly readjust in order to keep you connected to the world around you. To appreciate the richness of your world-indeed your vision must be dynamic!
Your eyes function because they are a well organized system of carefully integrated optical elements provided by mother nature.When the various parts of your eye are working in concert, light enters your eye, and is bent, or refracted through a transparent layer of tissue known as the cornea. The cornea takes widely differing rays of light and bends them through your pupil, which is the the dark, circular opening in the center of the colored portion, called the iris.
Your eye's lens, which is located just behind the pupil, makes delicate adjustments in the path of the light to bring images into focus on the retina. The retina is the nerve layer which contains photoreceptor nerve cells. These cells change the light into electrical impulses, and sends them through the optic nerve to the brain, which allows you to perceives it as an image.
