Telescopes, Light Vergence, and Accommodation
- 1 June 1977
- journal article
- research article
- Published by Wolters Kluwer Health in Optometry and Vision Science
- Vol. 54 (6) , 365-373
- https://doi.org/10.1097/00006324-197706000-00004
Abstract
This paper explains why the accommodative response to near objects is ineffective through a telescope. A simple formula is used to demonstrate the need for a bifocal spectacle objective or a change in vertex distance when viewing near objects with a contact lens spectacle lens telescope. Using this exact formula, clinicians can now more precisely compare refractions with and without a telescope. The formula also shows why refractions with telescopes used for driving should be accomplished at test distances of 20 feet or more.Keywords
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