Do you have a 20/20 vision? A person sees at 20 feet what a person with normal vision sees at 20 feet. Well finding out if you have a perfect vision is now a computerized procedure. Light is reflected off objects which travel through the lens in our eye and is focused upon the retina at the back of the eye. This sends the messages as signal to the brain via the optic nerve. Errors occur in our eyes. These are mostly due to imperfections in the cornea, lens, retina or shape of the eyeball.
Refractive errors are Myopia or nearsightedness, Hyperopia or farsightedness, Astigmatism and Presbyopia or aging eye. As a remedial measure we have glasses, contact lenses and laser eye surgery to reduce the refractive errors that prevent the proper focusing of rays on the retina.
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