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• Refracting telescope

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• Game engine

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• Autorefractor

  An autorefractor or automated refractor is a computer-controlled machine used during an eye

• Phoropter

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• Yerkes Observatory

  Yerkes Observatory ( YUR-kees) is an astronomical observatory in Williams Bay, Wisconsin owned by the University of Chicago Department of Astronomy and Astrophysics. The observatory, sometimes called "the birthplace of modern astrophysics", was founded in 1892 by astronomer George Ellery Hale and financed by businessman Charles T. Yerkes.It represented a shift in the thinking about observatories, from their being mere housing for telescopes and observers, to the early-20th-century concept of observation equipment integrated with laboratory space for physics and chemistry analysis. The observatory ceased operations in 2018.

• James Lick telescope

  is allowed on a limited basis. Also called the "Great Lick Refractor" or simply "Lick Refractor

• Achromatic telescope

  The achromatic telescope is a refracting telescope that uses an achromatic lens to correct for chromatic aberration.

• Refraction

  In physics, refraction is the change in direction of a wave passing from one medium to another

• Meudon Great Refractor

  Meudon Great Refractor (also known as the Grande Lunette) is a double telescope with lenses (83 cm