A simple variable prism with a linear scale

Research output: Contribution to journalArticlepeer-review


We wished to produce a simple variable prism with a linear scale, but a routine search of the literature revealed nothing that was suitable for our purposes. The Zeiss keratometer and some other ophthalmic devices use the variable decentration of single ophthalmic lenses to obtain prismatic effects combined with a fixed spherical power, and this concept appeared to hold promise.

Original languageEnglish
Pages (from-to)67-68
Number of pages2
JournalOptometry and Vision Science
Issue number1
Publication statusPublished - 1 Jan 2008


  • optics
  • vision sciences


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