Some advices when choosing sunglasses for the summer
Friday, June 24th, 2011
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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