The sunglasses are not just a fashion accessory. They must be really high quality glasses that actually protect your eyes from ultraviolet radiation from the sun. Otherwise, the pupil, “deceived” by the glasses, not shrinking from the light and the eye receives an additional dose of radiation, which can gradually lead to retinal burns or even blindness. Best forget about cheap (Chinese) imitations! Choose between glass and plastic lenses with varying degrees of shading and color of glass. A choice of frame depends on the shape of your face. If you do not feel prepared to make the choice yourself, consult an ophthalmologist or consultant in the shop recommended and offers the following criteria to comply with the choice of sunglasses.
Glass or plastic?
Glass lenses provide guaranteed protection from ultraviolet radiation and does not scratch (of course if you do not try and rub them with another example, glass or metal). Plastic is lighter and thinner, but modern coatings also allow them to be very resistant to scratches. However, let’s not cajole ourselves – even the plastic and the quality needs careful handling.
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The sunglasses are not only a stylish fashion accessory, and an essential tool to protect the eyes from ultraviolet radiation. Many mistakenly believe that UV-rays are strongest during the summer. This is not true. Is determining how much time you spend in the sun, whether summer or winter. Therefore, the glasses always so important to quality. The sunglasses is recommended to be glass. The newest course plastics are not so bad, but on them quickly scratches appear. Glass can be easily distinguished from the plastic by weight: it is much more severe. Apart from this window must have 100% protection from UV rays. Glass from polymers such as CR-39 and C-13 of most professional athletes who spend long hours in the sun.
Mirror lenses are spectacular, but still do not give 100% protection.
The degree of protection, which is usually indicated on the handle, label, or the passport of the glasses does not depend on the color of glass. Look for UV 400 mark! It means that the chemical composition of glass includes supplements that provide 100% protection in particular. The plastic frame glasses are more fragile in contrast to those whose frames are made of metal. Previously non-traditional materials such as rubber and titanflex easily recover form after bending or distortion, while the plastic does not possess such properties. Therefore, first, of course, the metal – the most expensive and most reliable material for frames.
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