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Japanese

A New Concept for Bifocals Yoshiharu Fujii 1 1Department of Ophthalmology, Nada-Kanazawa Hospital pp.1137-1140
Published Date 1975/10/15
DOI https://doi.org/10.11477/mf.1410205362
  • Abstract
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In popularly used bifocal lenses, the reading segments are located at the bottom of each le-ns. Accordingly, a bifocals wearer is forced to lower his eyes unnaturally for reading, and is troubled when he looks at his feet while walk-ing. The author contrived a new type of bifo-cal lenses for improving these defect.

Cut-out Fresnel lenses attached on ordinary spectacle glasses were used for the experiment.

A fan-shaped reading segment is placed at the lower medial part of each lens ; it fans out from the point near the center of lens to the lower inner quadrant.


Copyright © 1975, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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