Something almost essential for many drivers are the sunglasses, not only as a supplement (well, that too), but as an element of security, which is very annoying glare from the Astro Rey when we're behind the wheel. They are the most recommended type of glasses when driving (also for water sports and snow). Its main feature is its ability to reduce glare on surfaces such as snow, water and, of course, the hood of a car. This is achieved by polarization. What is polarization? For it is a process that controls the passage of light through the glass. Get minimizing glare horizontal light waves. But, although seemingly the Holy Grail of sunglasses, they also have drawbacks. For example, reduce the amount of light entering the eye, so they can not be used in sunglasses with clear lenses, especially if they are graduates. They can also produce distortion when viewing the liquid crystal clutch display of the car making illegible. Polarized lenses do not prevent all cases of glare, if the user tilts his head more than 45 degrees, some reflections can be accessed through the grooves between the strips of polarized and cause bright spots. Either way, this type of glasses are the most effective to this problem and its qualities make them the most suitable. Note: In the glasses to see in three dimensions also uses polarization. Some light is reflected vertically while another poraliza vertically, allowing you to create a sense of depth. . . .