January 1990
Volume 31, Issue 1
Free
Articles  |   January 1990
Measuring fundus landmarks.
Author Affiliations
  • A M Mansour
    Department of Ophthalmology, University of Texas, Medical Branch, Galveston 77550.
Investigative Ophthalmology & Visual Science January 1990, Vol.31, 41-42. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      A M Mansour; Measuring fundus landmarks.. Invest. Ophthalmol. Vis. Sci. 1990;31(1):41-42.

      Download citation file:


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

      ×
  • Supplements
This content is PDF only. Please click on the PDF icon to access.
Abstract

Three methods of determining the actual size of objects on the living fundus were utilized to measure the horizontal disc diameter (H) in 68 volunteers. H1 was calculated from fundus photographs based on the refractive power of the eye and according to the formula of Bengtsson and Krakau. H2 was derived from Littmann's trigonometric curves based on the anterior corneal curvature and the refractive power of the eye. H3 was derived from Littmann's trigonometric curves based on the axial length and the refractive power of the eye. H1 underestimated H2 by a mean of 0.91% (S.D. 2.19%) in 68 eyes. H3 underestimated H2 by a mean of 3.6% (S.D. 4.0%). We concluded that H1 was an acceptable approximation of H2 in a clinical setting and retrospective studies.

×
×

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.

×