For example, on the beach are advised to wear sunglasses with opacity of not less than 10%. Opacity glasses for glasses intended for country walks, maybe 25%. Take sunglasses indoors.
Points flat glasses harmful to the eyes, their glass should be slightly raised, as if copying the cornea of the eye. Well, if they are equipped with "two-way filtering", that is to absorb the extreme colors of the solar spectrum.
Colored glass is passed only rays of color in which they painted themselves. So try not to buy glasses with glass lilac, purple or red. Excellent protect the eyes glass green. Do not buy the glasses blue, they irritate the pupils and penetrating through them the sun's rays can easily burn the cornea.
When choosing sunglasses sure to pay attention to the material from which they are made. Glass lenses are less prone to damage than plastic, they do not distort the ultraviolet, however, are not suitable for children, can be broken and heavier in weight than plastic.
Glasses with plastic lenses is better to buy in specialized stores known brands. Such models are coated with a special anti-reflective, photochromic and a water-repellent coating.
Take a square weave fabric, put the glasses with plastic lenses down on the cloth, the better the lens, the less it will distort the image of the material. There is another quality test points. The area around the eyes, after you have removed the glasses, is not tanned.
Heavily tinted glasses with mirror reflection suitable for wearing in the mountains, with downhill sport, motorists are advised to wear sunglasses with dark gray lenses.
Properly chosen frame help hide facial imperfections. So, for round face is best suited glasses, glasses which have the shape of a trapezoid. Do not buy sunglasses with oval lenses, the frame should be modest, without thread and bright.
If you have a square face, you can buy or rectangular with rounded underside of the rim and having a shape of an equilateral triangle.
People with an oval face shape, it is recommended to buy glasses classical forms. Just make sure that the top line of the frame must comply with drawing your eyebrows.
Blondes are best suited glasses blue, emerald green and black. Brunettes can wear glasses gray-blue, red-haired - can choose glasses olive, pale green hue.