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Spherical Corrective Lenses

  • Sami G. El Hage
  • Yves Le Grand
Chapter
  • 223 Downloads
Part of the Springer Series in Optical Sciences book series (SSOS, volume 13)

Abstract

Glass has been most frequently used for spectacles. Quartz and rock crystal had a certain success in the 19th century (homogeneity, hardness, low dispersion, high conductibility of heat, which reduces fog). However, it is costly and transparent to harmful ultraviolet rays. For glass, we generally use a crown glass of index 1.51 < n < 1.53. Flint glass, or crown glass with a high index, would decrease curvature, but this advantage is of little consequence. Transparent plastic materials avoid breakage and are lighter than glass. Their use is becoming more frequent. Contact lenses are always made of plastic.

Keywords

Shape Factor Intraocular Lens Crystalline Lens Corrective Lens Rock Crystal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1980

Authors and Affiliations

  • Sami G. El Hage
    • 1
  • Yves Le Grand
    • 2
  1. 1.Eye Care AssociatesHoustonUSA
  2. 2.Director Du MuseeumParisFrance

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