An Aspheric Minus Pre-Set Lens for Slit Lamp Fundus Microscope Mutsuo Kajiura 1 , Hiroshi Hashimoto 2 , Fumio Takahashi 2 1Department of Ophthalmology, Fukushima Medical College 2Nippon Kogaku Co pp.381-384
Published Date 1973/3/15
DOI https://doi.org/10.11477/mf.1410204927
  • Abstract
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Two types of minus pre-set lenses for slit-lamp biomicroscopy of the fundus have been de-signed and fabricated.

1. A bi-concave lens with quadratic surfaces was devised to attain minimum deviation of the fundus image. This type has the drawback that it causes slightly more reflex from the lens surface than the meniscus one.

2. A convex-concave meniscus lens was de-signed having a high order aspheric surfaces. In spite of certain amount of deviation of the fundus image, it was possible to attain greater resolution power, lesser reflex or flare than the hitherto customary Hruby lens.

Copyright © 1973, Igaku-Shoin Ltd. All rights reserved.


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