Poor quality, that is what comes with cheap sunglasses. Low standards are not a problem with reputed brand names because their best sunglasses represent a continuation of tradition and the preservation of good reputation. What people don't know is that cheap eyewear could cause a lot of damage to the eyes. Dark lenses cause a dilation of the pupil, if there are no anti-UV protective features, then the ultraviolets and the infrareds become very dangerous for the eye. The radiations could impair sight and cause a wide range of ophthalmic dysfunctions such as affections of the crystalline or cataract.

Image distortion is one other flaw of poor quality sunglasses. This is often caused by plastic lenses that have faulty dioptric values which have not been established by medical prescription. Face match and comfort make other criteria for appreciating the features of the best sunglasses. Physiognomy plays an important role in the choice of sunglasses, and you will understand the difference between matching and not-matching glasses by trying several pairs on. Then, besides UV protection, the best sunglasses also reduce the glare by the anti-polarizing coating that covers the lenses.

Can lens color influence a classification of the best sunglasses? Well, there are different opinions here. The capacity to reduce light intensity and absorb the colors of the visible spectrum varies with the color. Not anyone can wear dark lenses for instance because they can reduce visibility: gray is usually preferred by drivers, pilots and many other users. The best efficiency in terms of radiation absorption features is that of green lenses, but green makes it hard to distinguish between colors. Greenaffects the perception of violet, blue, red and orange. For tropical locations, green lenses make the best sunglasses, not to mention the relaxing effect of the color.

Brown lenses are suitable in warm and cold environments as well, and they have a good capacity to absorb radiations. As for yellow lenses, wear them at sunset, at dawn or on foggy weather, because they are not efficient against intense brightness. The idea is that the best sunglasses are those that provide protection and comfort at the same time. Wraparounds have superior features too because they prevent the UV rays to affect vision on the sides of the eyes. Consequently, the properties of the lenses and the eye protection should justify a high price, and not fanciful frames.

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