Learn more about sunglasses and their lenses

There are many different models of sunglasses that have lenses made of different materials. Mirror lenses or such of anti reflective surface have an anti reflective layer in the outer surface of the lenses of the sunglasses. They are decreasing the radiance of the lightening which gets on the surface of the lenses. Mirror covering makes the objects look darker, so this covering is put on lighter lenses for compensation.

The expensive sunglasses have many layers in their lenses to make a more protective covering. These layers can include hydrophobic covering, which holds the water, anti-scratching covering which makes the sunglasses more durable.
Lenses you can change

Some models sunglasses are with changeable lenses in different colors. These systems with different lenses allow you to make the protection for your eyes according to your needs. You may need lighter lenses for cloudy and foggy days and you can change them whenever you want to. This is very useful if you need a good protection in different situations.
Polarized sunglasses

Polarization is a great characteristic if you enjoy water sports or your eyes are very irritable to reflections. When the light reflects itself on an even surface like a lake for example, this light is reflected horizontally creating a lot of radiance. Filters in polarized sunglasses block this horizontal reflection, decreasing the radiance and the tiredness of the eyes. In some cases polarized filters are reacting with the darkened lenses and create a blinding, which decreases the visibility. If this happens, you should buy yourself sunglasses with reflecting lenses as an alternative way while driving a car. The method used on polarized sunglasses has influence on the optical quality and the price of the lenses.

Cheap and plain sunglasses have a polarized filter in the outer layer. Steadier and much more expensive sport models have polarized filter between the different layers of the lenses. Latest technologies combine polarized filter with the material of the lenses, and the newest models are in a liquid form. This helps the filter and the lenses to unite without using any glue or other ingredients for a high level of optical quality.

Ultraviolet rays of the sun can damage your eyes that can lead to many eye diseases like cataracts, degenerations of the macula even cancer. All sunglasses have REI blocking of 100 percents of the harmful UV rays. UVB rays are the most harmful ones for our eyes. According to the American academy of ophthalmology, the long exposure of UV radiation of the sunlight is connected with the different diseases of the eyes. UVB radiation is considered to be more dangerous for eyes and skin rather than the UVA radiation. UVA rays are those, which are absorbed by the eyes. Although they are much safer than UVB rays, doctors recommend a good protection against them too. UVC rays are not dangerous because they are being blocked by the atmosphere.