There is nothing to expect from cheap sunglasses other than poor quality. 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, thus the entrance gate for the infrareds and ultraviolets will be a lot higher in the absence of UV protection features. Sight impairment, crystalline dysfunctions and cataract could be among the severest consequences of the exposure to radiations.
Another reason why you should always try to buy the best sunglasses possible is image distortion. The best sunglasses will not pose problems in terms of dioptric values although a doctor's opinion may be needed. A further criterion to appreciate the quality of the best sunglasses is by comfort and face match. 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, the best sunglasses also reduce the light reflection or glare by the presence of an anti-polarizing coating.
Can we select the best sunglasses by color too? Well, opinions differ here. The capacity to reduce light intensity and absorb the colors of the visible spectrum varies with the color. There are categories of wearers who cannot use very dark lenses because they would impair vision: gray is usually preferred by drivers, pilots and many other users. Green lenses have the highest efficiency in absorbing IR and UV radiation but they make certain colors hard to distinguish. Greenaffects the perception of violet, blue, red and orange. Nevertheless, when you are on vacation in some exotic location, green lenses make the best sunglasses, plus, this color has a very relaxing effect too.
Warm and cold environments are perfect for both cold and warm environments as well, and radiations are very well absorbed. As for yellow lenses, wear them at sunset, at dawn or on foggy weather, because they are not efficient against intense brightness. Protection and comfort, these is what the best sunglasses should provide. Wraparounds are among the most advanced of items because they protect the sides of the eyes too against the impact of the ultraviolets. Consequently, the properties of the lenses and the eye protection should justify a high price, and not fanciful frames.
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