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. This is often caused by plastic lenses that have faulty dioptric values which have not been established by medical prescription. 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, besides UV protection, the best sunglasses also reduce the glare by the anti-polarizing coating that covers the lenses.
Can we select the best sunglasses by color too? 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. 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. Green affects 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 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. The idea is that the best sunglasses are those that provide protection and comfort at the same time. Wraparounds are among the most advanced of items because they protect the sides of the eyes too against the impact of the ultraviolets. And keep in mind that the price should not reflect the special design of the frames or their glamorous look but the properties of the lenses. Eye protection is the most important!
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