orthoscopic

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or·tho·scop·ic

 (ôr′thə-skŏp′ĭk)
adj.
1. Having normal vision; free from visual distortion.
2. Giving an undistorted image. Used of an optical instrument.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

orthoscopic

(ˌɔːθəʊˈskɒpɪk)
adj
1. (Medicine) of, relating to, or produced by normal vision
2. (General Physics) yielding an undistorted image
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

or•tho•scop•ic

(ˌɔr θəˈskɒp ɪk)

adj.
pertaining to or characteristic of normal vision.
[1850–55]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Translations

orthoscopic

a. ortoscópico, rel. a los instrumentos que se usan para corregir distorsiones ópticas.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
These are the Intuitive Colorimeter (Cerium Visual Technologies), (4) the Chromagen contact lens system (Cantor-Nissel), (5) the Irlen lens system (Irlen Corporation), (6) and the Orthoscopics system (Ian Jordan).
Along with his team of scientists and engineers at Cambridge-based Orthoscopics, Ian has developed a special prescribing instrument called Read-Eye which finds the precise colour that gives best performance for each patient.
This new system of vision screening to analyse a person's visual perception has been developed by Ian's team of scientists and engineers at Cambridge-based Orthoscopics.
By contrast, many amateurs find that simpler designs like Kellners and Orthoscopics suffice for use on "slow" (high f/ratio) telescopes.
Where atypical responses are given, a clinical assessment is conducted using the Orthoscopics Read Eye (Orthoscopics, Cambridge, UK), which is the only instrument available that has the range and capabilities necessary to modify facial feature recognition using colour.
I did most of my observing with a Tele Vue 2-inch Everbrite mirror diagonal and a collection of eyepieces and Barlow lenses that range from today's premium wide-field designs, including Tele Vue Radians and Naglers, to orthoscopics dating back to the 1960s.
I had good luck with orthoscopics from University Optics, and with various Plossls, Radians, Panoptics, and Naglers from Tele Vue.
The difference that the work of Michael Gilsenan's orthoscopics clinic is having on the people of Warrenpoint--and further afield--is highlighted when OT spots one of his patients wearing tinted lens spectacles during the short walk to his practice.
Orthoscopics, Plossls, and economical Kellners really perform nicely in f/15 instruments, particularly for planetary viewing.
The BBC Spotlight Special documentary, which airs on BBC1 on February 16, follows teenager David Nesbitt as he is treated for visual stress by Michael Gilsenan (pictured), who runs the only orthoscopics clinic in Northern Ireland.
I had used many types of eyepieces for my observing - from wide-field Kellners and Erfles to Plossls and Orthoscopics. But when I first looked through Al Nagler's 13-millimeter eyepiece that summer, it was as though I had opened a big door to the universe and walked right through the telescope.
Orion's Explorer Orthoscopics, however, gave a substantially narrower window on the universe than the Plossl and RKE designs, while the University Optics 12-mm Plossl stood out for its unusually wide field.