What is Eyeglasses?
[[File:Briller2.JPG|thumb|right|150px|Normal pair of glasses]] [[File:Rejbrand-2004-275px.jpg|thumb|right|150px|A [[man]] wearing eyeglasses]] '''Eyeglasses''' (U.S), '''glasses''' or '''spectacles''' (also more rarely '''cheaters''') are pieces of [[glass]] or clear [[plastic]], called [[Lens (optics)|lenses]], that are held in front of a person's [[eye]]s by a frame made of [[metal]] or [[plastic]]. They can be used for many reasons. These include safety, fashion and to correct a person's vision. The earliest known eyeglasses are in the thirteenth century in [[Italy]].<ref>{{Cite book|title=Renaissance Vision from Spectacles to Telescopes|url=https://archive.org/details/bub_gb_peIL7hVQUmwC|last=Ilardi|first=Vincent|publisher=American Philosophical Society|year=2007|isbn=9780871692597|location=Philadelphia}}</ref> == Uses == ''Corrective'' lenses let some people see or read better if they have problems seeing. If the someone is [[Hyperopia|long-sighted]] (the light is focusses past the retina), they use a different type of glasses than someone who is [[Myopia|short-sighted]]. Lenses can also correct [[Astigmatism]]. [[Contact lens]]es also help people see better. Corrective lenses usually are made by [[optician]]s following [[eyeglass prescription]] from an [[optometrist]]. It's also possible to get [[adjustable focus glasses]] where one can change the lens power. R''eading glasses that are sold over the counter'' may help those with [[presbyopia]] who only need to wear glasses occasionally. They typically come in lens powers from +0.25 to +4. [[3d glasses]] are used during [[3d movie]]s. Glasses can also protect the eyes. [[Goggles]] and safety glasses are strong and protect the eyes from flying objects. [[Sunglasses]] (with dark [[tinted lens]]es) keep too much [[sunlight]] from getting in people's eyes. Some glasses are tinted for special applications, fashion and [[light sensitivity]] conditions. Some eyeglasses, often with yellow lenses, block blue light from a [[computer]], game, [[tablet]], [[smart