April 2014
Volume 55, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2014
Foundation and Applications of the Universal Intraocular Lens Calculator-Toric (UICT - wicked)
Author Affiliations & Notes
  • David Hjelmstad
    Physics, Mathematics, Arizona State University, Tempe, AZ
    The Eye Center, Champaign, IL
  • Samir I Sayegh
    The Eye Center, Champaign, IL
  • Footnotes
    Commercial Relationships David Hjelmstad, None; Samir Sayegh, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science April 2014, Vol.55, 1291. doi:
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      David Hjelmstad, Samir I Sayegh; Foundation and Applications of the Universal Intraocular Lens Calculator-Toric (UICT - wicked). Invest. Ophthalmol. Vis. Sci. 2014;55(13):1291.

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

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Abstract

Purpose: To provide an accurate, practical and universal tool to calculate the appropriate toric lens, across manufacturers, for patients undergoing cataract surgery with implantation of a toric intraocular lens (IOL).

Methods: An exact calculation of toric correction is performed with UICT. Choices are given between a two-step calculation starting with a spherical IOL value and a direct one-step calculation. Results are compared to the online calculators provided by the three FDA approved toric intraocular lens manufacturers (Alcon, Abbott, and Bausch & Lomb) as well as several calculators for CE approved but non FDA approved IOLs. 30 eyes corresponding to spherical powers ranging from 10-30 diopters and astigmatisms ranging from 1-7 diopters are evaluated with each calculator. A selection of most appropriate lens, across manufacturers, is provided. In addition, theoretical arguments are presented validating the calculation method of UICT/Wicked calculator.

Results: The lens selections of UICT are shown to be in agreement with existing calculators in the majority of cases. In addition, some important extreme cases highlight the shortcomings of some of the existing calculation schemes are highlighted. Our theoretical considerations show UICT is more reliable in these cases, preventing post-surgery refractive surprises.

Conclusions: We have verified the agreement of the UICT/Wicked calculator with existing calculators in the majority of cases, and demonstrated its superiority in extreme cases. These findings suggest a higher level of accuracy is feasible, including the prediction of the post-op astigmatism. The ability to select the most appropriate lens across manufacturers with choice of country of approval is an added practical feature of UICT.

Keywords: 567 intraocular lens • 428 astigmatism • 445 cataract  
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