Adjustment of anterior corneal astigmatism values to incorporate the likely effect of posterior corneal curvature for toric intraocular lens calculation

Journal of Refractive Surgery
Michael GogginLourens van Zyl

Abstract

To establish if average refractive overcorrection or undercorrection of corneal astigmatism based on the "rule" of the astigmatism occurs if toric intraocular lenses (IOLs) are calculated on the basis of anterior corneal measurements, and to calculate an adjustment for individual eyes to avoid this systematic error. One hundred forty-three consecutive eyes of 115 patients underwent phacoemulsification with IOL powers calculated using anterior corneal curvature data alone. Eyes were grouped as either "with-the-rule" or "against-the-rule" on the basis of the steep anterior corneal meridian. Targeted versus achieved astigmatic outcomes were compared. Main outcome measure was residual refractive astigmatism following the insertion of a toric IOL due to the likely effect of posterior corneal astigmatism. Significant prediction errors in astigmatic outcome occurred only with IOL cylinders of 2 diopters or less. Overcorrection occurred by a factor of 1.38 in with-the-rule eyes and undercorrection occurred by a factor of 0.65 in against-the-rule eyes. A coefficient of adjustment of 0.75 for with-the-rule eyes and 1.41 for against-the-rule eyes can be applied to the corneal astigmatism power value to calculate a more appropriate IOL cyl...Continue Reading

References

Jul 1, 1993·Journal of Cataract and Refractive Surgery·N A Alpins
Sep 28, 2010·Journal of Cataract and Refractive Surgery·Michael GogginAdrian Esterman
Feb 12, 2011·American Journal of Ophthalmology·Ken HayashiHideyuki Hayashi
Jul 7, 2012·Journal of Refractive Surgery·Michael GogginAdrian Esterman
Oct 17, 2012·Journal of Cataract and Refractive Surgery·Douglas D KochLi Wang
May 30, 2013·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Shane R Durkin, Michael Goggin
Oct 31, 2013·Journal of Cataract and Refractive Surgery·Douglas D KochLi Wang

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Citations

Jul 29, 2015·American Journal of Ophthalmology·Youngsub EomHyo Myung Kim
Jun 4, 2016·Journal of Cataract and Refractive Surgery·Adi AbulafiaGraham D Barrett
Jul 12, 2016·Journal of Refractive Surgery·Tiago B FerreiraFilomena J Ribeiro
Nov 9, 2016·Journal of Refractive Surgery·Yang Jae KimChul Young Choi
Sep 8, 2016·PloS One·Qinghe JingYongxiang Jiang
May 4, 2017·Cornea·Kristian NæserJesper Flethøj Bregnhøj
May 9, 2018·Journal of Refractive Surgery·Benjamin R LaHood, Michael Goggin
Dec 7, 2017·Indian Journal of Ophthalmology·Manpreet KaurJeewan S Titiyal
Aug 9, 2018·Journal of Refractive Surgery·Benjamin R LaHoodAdrian Esterman
Mar 12, 2018·Journal of Cataract and Refractive Surgery·Carmen CanovasPatricia Piers
Nov 17, 2015·Current Opinion in Ophthalmology·Praneetha ThulasiJ Bradley Randleman
Apr 16, 2017·Journal of Cataract and Refractive Surgery·Tiago B FerreiraJoão G O'Neill
Dec 22, 2019·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·C KernW J Mayer
May 3, 2020·Journal of Cataract and Refractive Surgery·Shira Sheen OphirMichael Goggin
Nov 15, 2016·Journal of Cataract and Refractive Surgery·Michael GogginAdrian Esterman
Nov 15, 2016·Journal of Cataract and Refractive Surgery·Yoshihiko NinomiyaTetsuro Oshika
Aug 6, 2020·Clinical Ophthalmology·Tiago B Ferreira, Filomena Ribeiro
Dec 10, 2020·Journal of Refractive Surgery·Olga ReitblatGuy Kleinmann
Jan 16, 2021·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Antoine LevronCorinne Dot
Sep 26, 2020·Zeitschrift für medizinische Physik·Achim LangenbucherNóra Szentmáry
Oct 17, 2020·Journal of Cataract and Refractive Surgery
Jul 9, 2021·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Achim LangenbucherPeter Hoffmann
Nov 3, 2021·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Achim LangenbucherPeter Hoffmann

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