But don’t glasses give me perfect vision already?

No. Refractive abnormalities are continually changing from day to day, from hour to hour, and from minute to minute. A fact that is easily verified by personal observation. Thus the accurate fitting of glasses or contacts is, of course impossible.
The difficulty of keeping glass clear is one of the minor discomforts of glasses, but is nevertheless a most annoying one.
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Likewise reflections of strong light from eyeglasses are often very annoying, and in the street may be very dangerous. Expensive coatings are needed to reduce these effects. In so doing, they reduce the brightness of colors. These coatings also require special cloths to clean, and they scratch easily requiring a hardness coating. Many people have great difficulties with glasses because of the activity of their lives, which not only leads to the breaking of the lenses but often throws them out of focus, particularly in the case of eyeglasses worn for astigmatism.
Contact lenses are difficult to clean and maintain. They are often dropped and lead to various eye diseases if not scrupulously cleaned. Astigmatism is often corrected poorly, due to the lens rotating on the eye. Even the most permeable contacts deprive the eye of oxygen and frequently capilaries begin extending into the cornea as a result. Extended wear lenses are notorious for causing infections and complications.
The progression of myopia often means that a perfect prescription is quickly inadequate and the the patient spends most of his or her time with a noticeable amount of refractive . (In fact, most optometrists undercorrect myopia to begin with — contrary to popular belief, 20/20 vision does not mean 100% of the human visual potential, but the average acuity of people living during the time the standard was established.)
In an emergency spectacles and contacts often become a serious hindrance. Droped or broken glasses often aggravate any already difficult situations.
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How Thonds Have Improved
Vision Naturally With This Easy Program
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this information courtesy of: nvifaq.htm
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http://www.your-vision-care.com






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