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Bioptics, also known as a bioptic in the singular, and sometimes more formally termed a bioptic telescope, is a term for a pair of vision-enhancement lenses. They magnify between two and six times, and are used to improve distance vision for those with severely impaired eyesight, especially those with albinism .
This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes . This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.
Telescopic glasses are "basically binoculars" that affix to glasses and magnify images so that objects look bigger, closer and clearer, said Palmer, who has specialized in this area since 2008 ...
Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most binoculars are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal-mounted military ...
glass mirror reflector: First large Ritchey-Chrétien: Flagstaff, Arizona, USA (Washington, D.C. until 1955) 1934 Plaskett telescope [7] 1.83 m: 72" glass mirror reflector: Designed as world's largest but beaten by the 100-inch Hooker telescope: Dominion Astrophysical Observatory, Canada, USA: 1918 Hooker Telescope: 2.54 m: 100" glass mirror ...
Hale Telescope Palomar Obs. 200 inch 508 cm 1949 USA: Hooker Telescope Mount Wilson Obs. 100 inch 254 cm 1917 USA: McDonald Obs. 82 inch i.e. Otto Struve Telescope: 82 inch 208 cm 1939 USA: David Dunlap Observatory: 74 inch 188 cm 1935 Canada: Plaskett telescope Dominion Astrophysical Obs. 72 inch 182 cm 1918 Canada: 69-inch Perkins Telescope [10]