First, the sunglasses should provide protection from ultraviolet rays. Light from ultraviolet (UV) rays can damage both your cornea and your retina. A high quality pair of sunglasses might completely eliminate any UV rays.

Sunglasses can shield strong light. When additional light hits the eyes, the iris closes. After the iris has closed as much as possible then the next step is squinting. If there is still extra light, such as from the brightness of snow, then this will cause damage to the retina. Sunglasses should be well made to eliminate as much as 97 percent light to avoid damage to your eyes.

Sunglasses protect your eyes from the sun's harmful rays. Light reflection off surfaces such as water can cause bright spots. These spots can be distracting or prevent you from seeing an object. Great sunglasses can completely eliminate this kind of glare with polarization.http://www.louisvuittonsunglasses.co.uk/