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Sunglasses allow better vision in bright daylight, and may protect one's eyes against damage from high levels of ultraviolet light. Typical sunglasses are darkened for protection against bright light or glare; some specialized glasses are clear in dark or indoor conditions, but turn into sunglasses when in bright light. Most sunglasses do not have corrective power in the lenses; however, special prescription sunglasses can be ordered. Specialized glasses may be used for viewing specific visual information (such as stereoscopy) or 3D glasses for viewing three-dimensional movies. Sometimes glasses with no corrective power in the lenses are worn simply for aesthetic or fashion purposes. Even with glasses used for vision correction, a wide range of designs are available for fashion purposes, using plastic, wire, and other materials. William and the friend Jason bring their bicycles on the attic, shrink themselves, and embark on a journey. They meet Sir Simon because he is getting ready to leave for the tournament, and so they stop at his castle. They spend more time a boy plus a girl with the castle and together. The girl tells them of an omen her grandmother, Calendar, kept repeating before she died. Sir Simon sent Calendar away for the convent as he thought she was crazy and he does not believe the omen. Few accept it but Calendar's granddaughter does. Jason and William believe it too. Akilan?s ?Kayalvizhi? can be a gripping saga set in the Pandiya kingdom background. His other novels include ?Vengayin Maindhan?, ?Kanni Maadam? and ?Vettri Thirunagar.? ?Vengayin Mainthan? has won the Sahitya Academy Award in 1963. ?Vettri Thirunagar? depicts the life of Viswanatha Nayaka of Vijaya Nagar who had been the founder of the Nayakas. He played a major role in integrating the country. Amazingly, there isn't a lots of scientific research about how glasses can transform the way in which people see you -- instead of how they see what's facing them. But there's a high correlation with the Hollywood notion the fastest way to turn actors into giving the impression of scientists is always to make them wear a pair of not too flattering spectacles.