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The lens of the eye bends light so that the light can enter the eye through the pupil. After entering the eye, light passes through the vitreous body – which most people think of as the eyeball. The retina is a membranous tissue lining the inside of vitreous body.
Millions of light-sensing nerve cells called rods and cones are found in the retina. Named for their unusual shapes, these rods and cones convert light into chemical impulses which are transmitted to the brain through the optic nerve. The optic nerve is coupled to the far side of the retina, just opposite the pupil. A tiny blind spot exists just where the optic nerve joins the retina because there are no rods or cones here.
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