May 2005
Volume 46, Issue 13
ARVO Annual Meeting Abstract  |   May 2005
Aphakic Intraoperative Refraction for IOL Calculation (AIRIC)
Author Affiliations & Notes
  • P.A. Shah
    Ophthalmology, California Pacific Medical Center, San Francisco, CA
  • D.F. Goodman
    Ophthalmology, California Pacific Medical Center, San Francisco, CA
  • Footnotes
    Commercial Relationships  P.A. Shah, None; D.F. Goodman, None.
  • Footnotes
    Support  Pacific Vision Foundation
Investigative Ophthalmology & Visual Science May 2005, Vol.46, 818. doi:
  • Views
  • Share
  • Tools
    • Alerts
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      P.A. Shah, D.F. Goodman; Aphakic Intraoperative Refraction for IOL Calculation (AIRIC) . Invest. Ophthalmol. Vis. Sci. 2005;46(13):818.

      Download citation file:

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

  • Supplements

Abstract: : Purpose: To evaluate the feasibility of a novel refraction based method of IOL calculation which may improve the accuracy of post–LASIK IOL calculations. The results of Phase I: AIRIC in normal patients is presented here. Methods: 20 normal patients undergoing routine phacoemulsification procedures were enrolled. Intraoperative autorefraction of the aphakic eye was performed after cataract removal, and the refractive vergence formula was used to derive the emmetropic IOL power. These results are compared to the pre–operative emmetropic IOL power calculations derived from the IOL Master. Results: Initial results show the mean difference in AIRIC derived emmetropic IOL power versus IOL Master derived emmetropic IOL power is –1.13D (range –2.5D to +0.5D). This would theoretically result in an average post–operative refraction of +0.8D (range +1.68D to –0.35D). Mean difference in intraoperative autokeratometry was +0.55D (range –0.96 to +0.75D). Conclusions: Aphakic Intraoperative Refraction for IOL Calculation (AIRIC) on average slightly underpowers the emmetropic IOL power as calculated by the IOL Master. Nonetheless, since this method of calculation is less dependent upon accurate keratometry, and weighted more heavily upon the accuracy of the refractive measurement, it may play a role in developing a more reliable method of IOL calculation for post–LASIK cataract patients in the future. Further refinements will likely improve the accuracy of this method.

Keywords: cataract • refractive surgery: other technologies • refraction 

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.