What's New

Code update

App Description

Determine resultant lens over existing lens combined with over refraction. Makes contact lens fitting more accurate. Useful in refining high powered eyeglass prescriptions using over refraction. Quick and easy to use application determines resulting contact lens prescription or spectacle prescription using lens currently worn and over refraction data. Exact results or round to one quarter diopter.

iPhone Screenshots

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Crossed Cylinder Calculator screenshot 1 Crossed Cylinder Calculator screenshot 2

iPad Screenshots

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Crossed Cylinder Calculator screenshot 3 Crossed Cylinder Calculator screenshot 4

App Changes

  • February 12, 2015 Initial release
  • August 26, 2015 New version 1.1
  • June 14, 2019 New version 1.11
  • September 16, 2023 New version 1.12

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