There is nothing to expect from cheap sunglasses other than poor quality. On the other hand, reputed brand names are a guarantee of great quality standards because this is how they preserve reputation and continue tradition. 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. 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, opinions differ here. The capacity to absorb the colors of the visible spectrum and the reduction of the light intensity vary depending on 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. 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. For tropical locations, 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 they have a good capacity to absorb radiations. Yellow lenses on the other hand are not useful against intense brightness but are great for foggy weather or driving at sunset. 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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