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.
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. If you try more pairs on, you’ll see that there is a big difference between matching and not-matching glasses, as they have to fit well on the face. Then, the best sunglasses also reduce the light reflection or glare by the presence of an anti-polarizing coating.
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: this is the reason why drivers, pilots and many other wearers prefer gray. The best efficiency in terms of radiation absorption features is that of green lenses, but green makes it hard to distinguish between colors. Greeninterferes with 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. Yellow lenses on the other hand are not useful against intense brightness but are great for foggy weather or driving at sunset. 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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