December 2002
Volume 43, Issue 13
Free
ARVO Annual Meeting Abstract  |   December 2002
VHF Wide-Angle Ultrasound Biometry of the Anterior Segment for Toric Lens Placement
Author Affiliations & Notes
  • MJ Rondeau
    Ophthalmology and Margaret M Dyson Vision Research Institute
    Weill Medical College of Cornell University New York NY
  • G Barcsay
    Ophthalmology Semmelweis University of Medical Sciences Budapest Hungary
  • R Krishnamurthy
    Ophthalmology
    Weill Medical College of Cornell University New York NY
  • T Du
    Ophthalmology
    Weill Medical College of Cornell University New York NY
  • RH Silverman
    Ophthalmology and Margaret M Dyson Vision Research Institute
    Weill Medical College of Cornell University New York NY
  • DZ Reinstein
    Ophthalmology
    Weill Medical College of Cornell University New York NY
  • D Coleman
    Ophthalmology and Margaret M Dyson Vision Research Institute
    Weill Medical College of Cornell University New York NY
  • Footnotes
    Commercial Relationships   M.J. Rondeau, None; G. Barcsay, None; R. Krishnamurthy, None; T. Du, None; R.H. Silverman, None; D.Z. Reinstein, None; D. Coleman, None.
Investigative Ophthalmology & Visual Science December 2002, Vol.43, 4358. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      MJ Rondeau, G Barcsay, R Krishnamurthy, T Du, RH Silverman, DZ Reinstein, D Coleman; VHF Wide-Angle Ultrasound Biometry of the Anterior Segment for Toric Lens Placement . Invest. Ophthalmol. Vis. Sci. 2002;43(13):4358.

      Download citation file:


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

      ×
  • Supplements
Abstract

Abstract: : Purpose: The successful use of both aphakic and phakic toric intraocular lens for correction of astigmatism is dependent on precise lens alignment with the astigmatic axis. This study models anterior segment ultrasound biometry and examines it's relationship to the axis of astigmatism. Methods:Twenty eight eyes of 14 healthy human volunteers were scanned using a custom wide angle VHF scanner. A series of 6 radial scans provided hemispheric coverage at 30 degree increments. Anamorphically corrected biometric angle to angle and sulcus to sulcus measurements were modeled using a direct least-squared method that constrains to an ellipse. Circular and directed statistical techniques were used to evaluate the data. Results:The semi-major axis as determined from the ultrasound data is not strongly correlated with the refractive or the keratometrically determined axis of astigmatism. Simulation studies show the ultrasound measurement and analysis technique to be a robust estimator. Conclusion:Measurements of elliptical conformation of the angle and sulcus suggest that assumptions concerning corneal curvature and the greatest diameter internal axis are incorrect. This finding has implications for future IOL haptic design and demonstrates the possible need for individual measurements to ensure proper lens placement.

Keywords: 432 imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • 551 refractive surgery: phakic IOL 
×
×

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.

×