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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. Today's world is filled with technologies, chemistry projects, social projects but nonetheless now we have been following a thought of their stage or dais. The only changes are happened genuinely: their drama was performed in open air now it's within the covered area; at that time drama was performed only morning these days we are able to enjoy thrice each day; there was clearly no strategy of light facilities today it can be totally computerized; that period dais was fixed and after this it can be revolving. Physical fitness as we know it today is miles from which it began. It began as simply survival then converted into preparation for war then began some very early competitive sports. Later it became philosophical since the body was admired for its beauty and strength. For a brief time, the main objective turned to preparation for war and after that it ventured into a medical standpoint as the great things about health and fitness came to light. Then we became sedentary and began to recognize the requirement for physical fitness in different ways. Thoughts on the other hand turned time for competitive sports and, next few centuries, evolved into the present day day revolution that people see and hear a lot about. Physical fitness has evolved in the centuries from basic survival to health awareness.