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Choose comfortable sunglasses, that is, glasses which are dark enough to protect from intense, but not too dark, as it could reduce your visibility. The more intense the light (for example, on high altitude ski slopes or on the sea), the darker the glasses. However, most sunglasses are suitable for a vast range of light intensity.

Types of lenses: Ordinary sunglasses lenses almost uniformly reduce all light intensities. Polarized lenses are specially conceived to reduce reflected glare -- that is the sunlight reflecting on gliding surfaces, like water or snow. Polarized sunglasses are thus particularly intended for driving. They can also be useful for fishing, as they provide a better vision of water. Moreover they block the major part of the light reflecting in water at certain angles.

Photochromic lenses react to UV intensity - they darken when outside and lighten when inside. In general, the darkening happens within 30 seconds, whereas it takes about 5 minutes to lighten. These lenses are also sensitive to temperature; they darken in low temperature. Photochromic lenses have uniform or graduated tints. If you are thinking of wearing them for driving, choose quite dark lenses, because the roof and windows of the car already block a major part of the UV rays, so, the lenses will not darken too much.

"Mirror" lenses reflect all or part of the useless light rather than absorbing it as ordinary sunglasses do. They do not offer any particular benefit. Metallic surfaces get easily scratched; it is thus better to choose scratch resistant lens surfaces.

Nowadays, most lenses are plastic lenses. Thin lenses always remain, as plastic is more resistant than glass and, as a result, is less easily broken. Very thin glasses would not resist high impact trials. Polycarbonate plastic, used in the production of sport sunglasses, is particularly resistant, does not break at the slightest impact, and due to an adequate surface, can overcome scratches. Glass lenses do not get scratched that much, but are heavier. If you buy polycarbonate plastic lenses, be sure to buy those which have a scratch resistant coating.

Before buying sunglasses, be sure that they do not distort your vision. Try them by looking at a rectangular object, for example, at floor tiles. If the lines remain straight, distortion is insignificant.

If you will be exposed to direct sunlight for long periods of time, it is better for you to wear panoramic sunglasses or glasses with lateral screens.

• Light and UV rays
• Eyes and UV rays
• Why wear sunglasses?
• UV protection

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