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Cover illustration: The steroscope
  • Richard Keeler,
  • Arun D Singh,
  • Harminder S Dua
Br J Ophthalmol 2009;93:283

  1. Plus lenses?

    University of Glasgow

    Dear Editor

    Out of ignorance, I am surprised that the lenses in a stereoscope should be described as "plus" lenses. They may be so, but I would have expected the more important property to be prism, to aid superimposition of the paired images.

    Please clarify the optics involved.

    BLC

    Submit response
    Published 2 March 2009
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