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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. According to bestseller book Occupational Therapy and Mental Health, author J Creek shows that approximately 27% of most Europeans are afflicted by some form of mental illness, almost 45% to 75% with moderate to severe physical illness and approximately 35% to 45% from some sort of psychiatric disorders like anxiety or depression that need adjustments to the approach to life and occupational activities. Occupational treatments are apparently a self explanatory term quite a few people have an obvious misconception about the benefits, likely candidates and uses of occupational therapy.