Design of Aspherical +28D Lens for Indirect Ophthalmoscopy Mutsuro Kajiura 1 , Hirokazu Okajima 2 , Makoto Uehara 2 1Department of Ophthalmology, Fukushima Medical College 2Nippon Optical Co., Ltd., pp.1447-1450
Published Date 1976/12/15
DOI https://doi.org/10.11477/mf.1410205563
  • Abstract
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Technical data are presented for the newly-devised aspherical lens for indirect ophthal-moscopy. This +28D lens allows the observa-tion of large fundus area subtending an angle of 55 degrees. A bright fundus image can be obtained because of the considerable size of the lens (38.8mm in effective diameter). A distor-tion-free fundus image is obtained with 2x magnification. The reflex from the lens surface was effectively eliminated with the use of mul-tilayer coating. The lens weighs just 42g. It is also good for examination of the fundus periphery. The lens promises to be of consi-derable clinical value as adjunct or even as replacement for the hitherto available +14D, +20D and +33D Nikon aspherical lenses.

Copyright © 1976, Igaku-Shoin Ltd. All rights reserved.


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