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. But unconsciously, we all know that fire may serve as a friend as well as a foe for people, as are actually written above, fire provides as our friend whenever we will tried it on proper ways. But we should use caution since there are times that fire can be our foe as we misuse it. A fire can destroy your lifetime long investments, it may even detract lives. Like consider the Great Fire of London for example, wherein the hearth started from a bakery the location where the baker left the oven lit. Let's say that you have a situation wherin you happen to be trapped somewhere while everything around you is ablazed by fire, How will you build your way out of computer? Is there a chance that you're going to survive the raging fire? Well, the solution is yes. How will it's possible? Just try and follow these items: