September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Stability and Variability of Calculators for FDA approved Toric Intraocular Lenses (tIOLs)
Author Affiliations & Notes
  • Fatma Dihowm
    Prince George's Hospital Center, Cheverly, Maryland, United States
    The EYE Center, Champaign, Illinois, United States
  • Samir I Sayegh
    The EYE Center, Champaign, Illinois, United States
  • Footnotes
    Commercial Relationships   Fatma Dihowm, None; Samir Sayegh, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 926. doi:
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      Fatma Dihowm, Samir I Sayegh; Stability and Variability of Calculators for FDA approved Toric Intraocular Lenses (tIOLs). Invest. Ophthalmol. Vis. Sci. 2016;57(12):926.

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

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Purpose : To assess the stability of IOL online calculators for FDA approved tIOLs through and during the second decade of the twenty first century and propose a universal tool to address their limitations.

Methods : In this comparative study, the available software programs for manufacturers of tIOLs were identified and used to calculate cross cylinder, choice of one or more tIOL and corresponding residual astigmatism for 45 standardized representative cases combining different degrees and orientation of corneal and surgical induced astigmatisms for IOL spherical equivalent (SE) and for spherical powers ranging from 10 to 30 diopters. The results for each available calculator, obtained in 2015, were compared to results for same inputs as conducted in 2013. A subset of results available and documented since 2011 were also compared with results for 2015.

Results : One of the online calculator was no longer available at the time of the second testing. The other calculators remained relatively stable with the exception of the introduction of newly approved tIOLs extending the previous range. The limitations associated with all calculators as pointed for example by (Goggin et al 2011) and (Dihowm, Hjelmstad and Sayegh, Investigative Ophthalmology & Visual Science April 2014, Vol.55, 3749; Dihowm, Jabra and Sayegh, Investigative Ophthalmology & Visual Science June 2015, Vol.56, 1907) remained.

Conclusions : Online toric calculators from major IOLs manufacturers remained relatively stable over a period of several years. On the one hand this can help develop a significant intuition and experience by surgeons using them in daily practice. However as discrepancies and limitations remain unaddressed, a critical review of tIOL calculators is needed. A possible tool to address these limitations, the UniversIOL calculator, is proposed.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.


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