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A digital personal health record (PHR) can be a computer-based software that lets you store a variety of personal health information including illnesses, hospitalizations, encounters (i.e. visits and communications), journal information in between doctor visits, medications, allergies, immunizations, surgeries, lab results, and ancestors and family history. The personal health record differs from an electronic digital medical record which can be a similar application with considerably more all-encompassing features used by healthcare providers for example scheduling and insurance billing, besides the storage of patient health data. Owning and looking after an up-to-date digital personal health record has several benefits and is the cornerstone of proactive healthcare involvement and better healthcare experiences. 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.