A Kind Of Special Eyewear--bifocal Sunglasses

Before we talking about bifocal sunglasses, it is necessary to define bifocal glasses at first

. Bifocals are those eyeglasses whose lenses are joint by two pieces of lenses of different refractive indexes. They can be divided into visible and invisible bifocals. Provided with two kinds of lenses of different refractive indexes, the wearers suffering from both nearsightedness and presbyopia in their older years would enjoy a clear vision both far and near.

Knowing the definition of bifocal glasses, one could easy to know what bifocal sunglasses are--bifocals whose lenses are tinted with different colors for the sake of protecting wearers from harmful rays. Bifocal sunglasses can be perfect choices for the middle aged men who are more inclined to suffer from both nearsightedness and presbyopia. However, with years' development, there has emerged kinds of bifocal sunglasses designed for young men, because the refractive indexes of the two pieces of lenses can be flexibly combined. In addition, wearing bifocal sunglasses is good for eyes and eyesight.

Researches have been made among 135 children, half of whom are arranged to wear single vision eyeglasses, while the rest of whom are arranged to wear bifocal lenses. As a result, it is reported that the former group of children get fast in the acuteness of their eyesight several months later, while the latter group get much slower. Therefore, it is not hard to be concluded that bifocal eyeglasses are able to defer the growth of myopia. Since bifocal eyeglasses have such a function, bifocal sunglasses are also thought to be able to achieve the same result. Then with proper combination, bifocal sunglass wearers could benefit more from this kind of eyeglass.

Those eyewears initially used for vision correction can filter out almost all UV, glares and some other harmful rays, so they are really good alternatives for one who have both near vision and far vision problems in summer. However, bifocal sunglasses, for it costs high in material expense and technical cost, usually charge high prices. In common circumstances, $200 to $400 is needed for each pair. Maybe not every one is able to afford.

Nevertheless, the good news is that if visiting www.firmoo.com, you could get cheap bifocal sunglasses more than 50% off, which could save you a great amount of money. What are you waiting for? If you do need a pair, get hurried!

by: homas Carter

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