The glasses must be manufactured under an EU directive 89/686/EEC, giving them optimal conditions of quality endorsed by the European Union. This mark ensures that the eye is protected from ultraviolet radiation (UVA and UVB), infrared radiation and visible radiation (light that we perceive).
Sunscreen protects our eyes from harmful radiation from the sun to the eye without adversely modify the colors and contrasts. You must choose a pair of sunglasses with a filter that fits the use to which they will give.
The color of the lens is important to know that the color and how dark the lens does not determine its degree of protection and a greater ability to block ultraviolet light. In addition, different tones and colors represent different usage recommendations.
Other recommendations, in addition to those already mentioned, the ideal sunglasses should cover the front and side of the sun. Your form must be protected as well as allowing a perfect view. The best practice is to be with crystals or organic, never plastic because it tends to warp over time.

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