Rose-colored glasses are harmful to the eyes.

It depends on your preference and taste what color to wear sunglasses. However, when choosing a model should take into account the recommendation of doctors. Not all fashion colors successfully cope with the protection of our eyes from ultraviolet radiation. Only classical sunglasses lens (dark colors - dark blue, black, dark brown) delays a sun rays well. And by the way, in the current of summer collections of this season was dominated just models with lens in black, brown, gray. At some designers there are shades of purple, lilac.

A light lens, as well as red and green, even if you have less squinting from the sun, play only a decorative function and serve as a nice complement to the clothes only. Yellow glasses are recommended for athletes, as an excessive voltage is removed from the eyes due to the fact that increases the contrast of the image. But the proverbial rose-colored glasses are unlikely to make life easier: That lens shade does not protect from UV light, do not protect against solar radiation and is causing eye strain even more. And one more thing: shades of pink have a negative impact on the psyche. If you have good eyesight, any shape and color of lens will fit you of almost, the main condition - maximum protection from ultraviolet radiation, preferably 98-100%. If you see the bad, you have to get consultation of ophthalmologist in the selection of sunglasses.

How to choose sunglasses.

Look at the bright, colorful world of summer is just unbearably painful if you without sunglasses. When choosing their usually we are interested in two questions: "Is it fit to me?" and "How much?" Advanced customers can also ask about what kind of protection from ultraviolet radiation has favorite model. Here, properly speaking, all questions from average consumer to seller got to come to an end. But, if in choosing sunglasses seriously, but it should not be limited.

You should always pay attention to the material from which made the sunglasses, lenses color and marking. But first things first. Modern optical industry uses to make sunglasses glass and plastic. For a long time, glass lenses were considered the best material because it provides good protection from UV light and less distorted picture. Glass is more resistant to scratches, and its life longer. But in recent years, high-quality polymeric materials appeared, in no way inferior to the mineral (glass), and in some ways even superior to them, and many manufacturers now give preference to plastic. To protect your eyes from harmful radiation, in the manufacture of the plastic are employing special chemical compounds, and on a finished lenses are applied special coating. Sunglasses from such material are obtained light in weight and more practical than glass, which has one drawback - the fragility and traumatism (and therefore sunglasses with glass lenses are not recommended to wear for athletes and children). Plastic also has one drawback - the distortion of objects, but it can be verified by fitting of sunglasses: with qualitative lens, straight lines should not be distorted. Of course, sunglasses - a fashion accessory that adds your charm, mystery and solemnity. Still, their main purpose is different: to weaken the visible light to a comfortable feeling; further weaken the blue light range, the most dangerous to the retina and is the cause of photoretinit (burns the retina by light); to block ultraviolet light, causing a burns to the cornea and conjunctivitis; retain ability to distinguish between traffic signals.

There are five categories of lens opacity in sunglasses:

     0 - let pass 80-100% of the light (lens clear or lightly shaded);

     1 - let pass 43-80% of the light;

     2 - let pass 18-43% of the light;

     3 - 8-18% of the light is passed;

     4 - let pass 3-8% of the world (very dark lenses.)