Significance of optic formula selection for postoperative refraction after cataract operation

Klinische Monatsblätter für Augenheilkunde
Peter HoffmannH B Eckhardt

Abstract

Prediction of postoperative patient refraction is of paramount importance in modern cataract surgery. The choice of the IOL calculation formula plays a major role here. The influence of popular calculation formulas is evaluated in a prospective study. We performed cataract surgery on 539 eyes with PC-IOL implantation in the capsular bag. The IOL power was computed using 10 different calculation formulas with the help of a personal computer. Patient refraction was examined two days and six months after surgery. The mean difference between desired and obtained refraction was -0.11 +/- 0.88 dpt 83% of all patients were in a +/- 1 D interval of desired refraction with a median visual acuity of 20/25. The formula used contributes a major part to the precision of calculation despite all problems due to errors of measurement. The theoretical formulas with variable "pseudophacic anterior chamber depth" are superior to the older ones. Standard deviation of the worst formula tested is 25% higher than that of the best one. With the best formula tested there would have been a good result (error < or = 1 D) in 82% of the cases, with the worst one in only 72%. The use of older formulas like SRK and Binkhorst should be discontinued and only t...Continue Reading

Citations

Oct 12, 2012·PloS One·Filomena J RibeiroJoão M Dias
Aug 29, 2001·Journal of Cataract and Refractive Surgery·M LundströmU Stenevi
Apr 20, 2000·Journal of Cataract and Refractive Surgery·W W HuetzA Heuring
Aug 6, 2002·Journal of Cataract and Refractive Surgery·Paul-Rolf PreussnerOliver Findl
Mar 24, 2007·Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·M BergemannR F Guthoff
May 15, 2012·Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·A LangenbucherU Schönherr
Oct 12, 2004·Journal of Cataract and Refractive Surgery·Mats LundströmWilliam Thorburn
Jun 13, 2002·Acta Ophthalmologica Scandinavica·Mats LundströmWilliam Thorburn
Oct 24, 2007·Macromolecular Bioscience·Jens TrägerNorbert Hampp
Aug 10, 2010·Journal of Cataract and Refractive Surgery·Peter Christian Hoffmann, Werner W Hütz
Mar 21, 2000·Current Opinion in Ophthalmology·B Seitz, A Langenbucher

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