September 1995
Volume 36, Issue 10
Free
Articles  |   September 1995
Axial and instantaneous power conversion in corneal topography.
Author Affiliations
  • S A Klein
    School of Optometry, University of California, Berkeley 94720-2020, USA.
  • R B Mandell
    School of Optometry, University of California, Berkeley 94720-2020, USA.
Investigative Ophthalmology & Visual Science September 1995, Vol.36, 2155-2159. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      S A Klein, R B Mandell; Axial and instantaneous power conversion in corneal topography.. Invest. Ophthalmol. Vis. Sci. 1995;36(10):2155-2159.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

PURPOSE: To determine if a direct relationship exists between the two common measures of corneal topography--axial and instantaneous powers--that are based on corneal slope or curvature, respectively. METHOD: The theoretical relationship between axial and instantaneous powers was derived for unrestricted shapes using equations of basic calculus. RESULTS: It was found that axial power at any point y on the cornea is exactly equal to the average of the instantaneous powers from the axis to point y. CONCLUSIONS: A simple relationship exists between axial and instantaneous powers that is valid for the intersection of any surface by a meridional plane. This provides a practical means for converting between axial and instantaneous powers for clinical applications of corneal topography.

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×