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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. 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.