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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. The Romans built several roads across Villamartin and also over time numerous artefacts happen to be discovered. Visigoth remains are also found. More recent finds happen to be from Arabic and Christian people. From the 8th century A.D. the complete region fell under Muslim control. The Matrera fields formed area of the Cora territory of Ronda. The closeness of Arcos, which belonged on the Cora de Medina, drove Omar Ben Hafsun, at the end of the 9th Century, to develop the fortress of Matrera, to defend Iptuci, one of the most advanced city within the Cora of Ronda.