You, your eyes and the sun:
Sun glasses are a necessary protection!

Buy sunglasses is more than choosing a great frame! Notice the glass. The more they have the following characteristics, the better the sunglasses! If you look at the quality of the glasses Serengeti brand scores highly because of the present blue filter, good color and clear image (no darkening!)! The glass can not be sharpened. So you must choose between a limited number of frames. If you want glasses strength is the delivery time a few weeks. Cost: + / - 375 E = 7000 fr for frame and glass.

 
PROTECTION AGAINST LIGHT: The intensity of the incident light can be reduced by the reflection (in "mirrored glass) or absorption (in" tinted glass ") and this depends on the color of the glass. Glare from behind is still annoying. Solution: side shields. Some glasses are fairly clear bottom (glass-degrade "), which reading will benefit. This latter is especially useful for people who are less clear.

 
QUALITY GLASS (you do not have sunglasses for € 5!): The glass is of good quality, as they provide good vision without distortion, and if they scratch, and break his vuurweerstandig. A ontspiegelingslaag (Anti-Reflet) is also useful. The color is good. Or the color of the glass (blue, green or brown) lens is not that important, except for color blind (green glass are then best avoided, although they usually give a slightly sharper picture)! Subjectively arranged a brown color chosen, because the world warmer than it looks.

 
UV FILTER: Colored glass reduce the harmful rays (especially ultraviolet ("UV")), but not eliminate them. So they can still invade the eye, even more than before because the pupil remains relatively high because of the reduced light intensity. The harmful rays give short-term irritant inflammatory phenomena (such as sunburn thv the skin), especially if radiation is present in excess (at higher elevations / environment with a lot of snow or water), and intake of psoralens for psoriasis. In the long run gives UV lens opacity (cataract). We all get this sooner or later. A good pair of sunglasses or clip can probably postpone). However, this can be solved with invisible ultra-violet filter (variable quality! What percent is filtered and what wavelength? Well: 100% filter to a wavelength of 310 nm). Serengeti blocking 98.5% UVA and UVB 100%!

FACT: 90% know that UV is harmful to the skin.
FACT: 9% know that UV is harmful to the eyes!
 

PHOTO CHROMATIC: The glass is dark or prepared according to the intensity and made it through the glass pigments (UV radiation causes the pigments to change the glass and so dark colors). That way, your eye fetch less effort to protect themselves against the light (normally done by the smaller or larger of the pupil, as the operation of a camera aperture). Thus, less eye fatigue. The speed of change between dark and you're very important because the constantly changing light intensity (when entering or when the sun disappears). A good photo chromatic glass has about 30 seconds to get dark and about 2 minutes needed for the other half to be ready. Only after 20 to 30 minutes, the glasses back as clear as possible! Thus you no longer need half glasses, which serves as sunglasses! Because the windshield blocking ultraviolet light, discoloring the glass by driving slower, although (in practice no problem). Tip: excessive heat or cold or sudden large temperature changes can process the crystal (sometimes permanently) disrupt leave your glasses behind the windshield does not lie!

 
POLAROID FILTER: made by crystals (linear fit), the horizontally polarized light filtered. A little more explanation: light is normally a three-dimensional electro-magnetic wave. By reflection at a surface can three-dimensional wave is split into two 2-dimensional waves (horizontal and vertical). The divisional horizontal wave shown experimentally to be responsible for the annoying reflections in bright sunlight (especially important for water (= fishing / sailing) and skiing). Yet it is these waves are filtered out by Polaroid glasses. If you have 2 polaroid glasses but put one above the other rotated 90 degrees compared to the other can no light through fall accordingly. This effect is responsible for the lattice-shaped shadows that you see when you look at some car windows with a Polaroid polarized sunglasses.
 
BLUE FILTER (introduced by Serengeti: the contrast sunglasses): Blue light refracts more than the other wavelengths in the human eye. This makes it a focal point of blue light on the retina rather than on the retina, so it appears fuzzier. This leads to the characteristic blue haze around objects in bright light (sun and snow), but also in foggy conditions (blue light in those circumstances is strongly reflected). With orange-brown glass that can filter out blue light and thus eliminate the haze. This leads to contrast enhancement. This blue light would also damage the retina in the long run, especially when available for patients (macular degeneration / retinitis pigmentosa). In some patients (retinitis pigmentosa / albinism) such sunglasses therefore reimbursed. Blue filter that exists since some years also Rayban and Zeiss
 
 
EXTRA FACTS:

- The color of the glass is not an indication of their filtering ability. The difference is fundamental: the color protects against glare from visible light, invisible through the filter against the burning UV. The material of the glass stops the UV rays, so colorless glass of the finest quality 100% of the radiation can stop and dark glasses of poor quality too much UV can penetrate ...

 
-Choose your frame not too small. The glass should be large enough to protect your eyes too light from above, from below or along side falls. Especially in the mountains where the snow reflected light in all directions, is very important.
 
-Can contact lenses protect the eyes from UV? There are special contact lenses that are UV adequate to stop and prevent glare. But be careful: they cover only a portion of the eye. The eyelids and the "white of the eye receive no protection and can be damaged.
 
-A European-standard quality for a number of sunglasses down. The glasses that it must meet the CE mark and are divided into 5 categories. Especially in sports goggles are the categories clearly stated!
 
Category 0: Aesthetics, comfort, weak or strong light overcast sky.
Category 1: Tempered sunlight or overcast sky.
Category 2: moderately strong sunlight.
Category 3: Strong sunlight. Sea, mountains, tropics.
                    This class is mandatory for children.
Category 4: Very strong sunlight. High mountains, glaciers, sea.
                    This category is prohibited from driving.

 
-SPORTS SUNGLASSES
You have the riders in the Tour also seen riding with futuristic sunglasses? Indeed such a spectacle is an effective protection against sun, but also from wind, flying dust and insectjes. More and more you see those sunglasses even in other sports (eg athletics). The frames and glass are also still outstanding qualities:
 
The glass is unbreakable and light. Moreover, the glass with an anti-scratch and anti-reflecting layer. Moreover, this a good UV filter present, Eye Burns to avoid if you drive long in the sun. The-art glasses are even equipped with a ceramic coating, "which gives additional advantages: better UV, scratch and impact protection. In addition, the ceramic layer anti-static so the attraction of dust particles is reduced (due to better visibility) and there is also an anti-vapor effect, the wicking capabilities of the layer. Because of that reason, the front glass of the best-drilled, for a better anti-vapor effect. For cyclo-crossers, the glass is additionally protected by a low-adhesives, during driving for 1 1 can be removed. This keeps your glasses always clean, and you do not suffer from the splashing mud.

 
The frame is made of anti-allergic materials, but that light is solid (especially important for the hinges). The upper edge of the glasses can be designed with a special mousse for sweat absorption. The front of the glasses can also be turned to good sun protection to get if you drive with bowed head. A full frame is better than single glass attached to a plastic rod, because the sharp falling edge of the optical section no head-and eye damage can give! Such sports glasses are no fad, but an ideal tool for comfortable cycling exercise.

 
Auto-strength sunglasses: Wear Drive Orgalit
 
Discolored, polarized glass with plastic Polaroid filter - basic is the glass is tinted yellow-greenish

• Contains yellow-green filter: increase contrast in cloudy weather because the glass-decolorization also comes in more light - also improved perception of green and red
• In bright light will discolor the glass from 68 to 88%. In the car they are copper brown. Outside they are dark brown. The latter occurs through the transitions process. Ie: there is a uniform pigment coating on the front face of the glass, dark discoloration by ultraviolet rays of the Sun This gives the best results in plastic and is independent of the strength of the glass.
• The filter helps to raid polo blinding glare on the road (lakes)
• UV absorption
   
  So ideal for driving the car in all weather conditions