The prediction of surgically induced refractive change from corneal topography

American Journal of Ophthalmology
R J SmithR K Maloney

Abstract

To develop a method to predict the refractive power of the cornea from corneal topography. We reviewed preoperative and postoperative cycloplegic refraction, keratometry, and corneal topography in 40 eyes of 40 patients who had undergone photorefractive keratectomy, radial keratotomy, myopic keratomileusis in situ, or hyperopic lamellar keratoplasty. For each axial dioptric power map, we calculated the aspheric ellipsoid that best fit that map. Central corneal points were weighted more heavily than peripheral points, based on the Stiles-Crawford effect. The equation of the best-fit ellipsoid yielded the spherical and astigmatic power and axis for each cornea preoperatively and postoperatively. The preoperative corneal spherical and astigmatic powers measured by the best-fit method were consistent with the spherical and astigmatic powers measured by keratometry and simulated keratometry. The change in corneal spherical power predicted by the best-fit method was significantly (P < .05) more accurate at predicting the change in spherical equivalent refraction than change either in spherical equivalent keratometry or in spherical equivalent simulated keratometry. The prediction of the astigmatic change was less precise than that of...Continue Reading

References

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Citations

Apr 17, 2002·Journal of Cataract and Refractive Surgery·Shuan Chen, Fung-Rong Hu
Jan 29, 2003·Journal of Cataract and Refractive Surgery·Dimitrios S SiganosGeorgios Papastergiou
Dec 24, 2013·Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission·K XuH Qi
Feb 11, 2014·Seminars in Ophthalmology·Nicola RosaMichele Lanza
Jul 2, 2010·Survey of Ophthalmology·Ron Gutmark, David L Guyton
Mar 24, 2009·Journal of Cataract and Refractive Surgery·Kenneth J Hoffer
Sep 25, 2008·Journal of Cataract and Refractive Surgery·Santos S Tseng, Joseph J K Ma
Jun 5, 2003·Acta Ophthalmologica Scandinavica·Omür O Uçakhan
Jun 25, 2005·Journal of Cataract and Refractive Surgery·Nicola RosaAntonio Romano
Feb 24, 2015·Journal of Cataract and Refractive Surgery·Chee-Wai WongDaphne C Y Han
Oct 19, 2016·Acta Ophthalmologica·Daniel BöhringerPhilipp Eberwein
Mar 20, 2004·Journal of Cataract and Refractive Surgery·Nicola RosaAntonio Romano
Sep 16, 2017·Korean Journal of Ophthalmology : KJO·Byeong Soo KangWon Ryang Wee
Dec 10, 2009·Current Opinion in Ophthalmology·Ayman Naseri, Stephen D McLeod
Apr 20, 2000·Journal of Cataract and Refractive Surgery·M D TwaD J Schanzlin
Jan 3, 2001·Journal of Cataract and Refractive Surgery·R PeterI Schipper

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