Vision Correction

Vision correction has taken so many strides, since 1265 when Venetian clerics first developed thick and ungainly spectacles. Today, the ease of use and comfort which eyeglasses, contact lenses and different refractive eye surgery alternatives provide make vision correction desirable and life-enhancing for millions of people around the world.

What is 20/20 vision? This essentially means that a person with normal eyesight can see clearly at 20 feet what should be seen at that feet. This means that when light rays shines on his or her eyes, his or her corneas will focus on the light rays, through the internal lenses. From here, the irises make the light rays better and pass it on to the retinas. Electrochemical reactions then trigger nerve impulses which are transmitted via optic nerve bundles and are then processed by the brain.

Vision correction becomes a need when refractive errors like a person’s eyeballs, corneas or lenses are imperfectly shaped. Here are the four most common errors:

• Myopia or nearsightedness — The person’s eyeballs is longer than normal from front to back, so images focus in front of the retina instead of on it. When this happens, the person experiences blurred vision.
• Hyperopia or farsightedness-some 62 million people in North America are farsighted. In this condition ones’ cornea/optical schematic is too short and light rays entering the eye focus behind the retina. When this happens, one can see distant objects clearly but objects up close are blurred.
• Astigmatism-for a person in this condition, his or her corneas are incorrectly shaped like footballs, making objects blurred at any distance.
•  Presbyopia is a condition brought about by the natural process of aging. Ones begin to lose the flexibility to focus when looking.

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