Clinical evaluation of the intraoperative refraction technique for intraocular lens power calculation

Ophthalmology
Albert Chak Ming WongRaymond Kwok Kay Tse

Abstract

To evaluate clinically the intraoperative refraction technique for intraocular lens (IOL) power calculation using 2 existing formulas proposed by Ianchulev and Leccisotti and to derive alternative formulas for this technique. Comparative case series. One hundred eighty-two eyes from 182 patients with cataract. Recruited patients were separated into a normal cornea group and a special group that included eyes with surgically altered corneas. Phacoemulsification was carried out for all cases. Intraoperative aphakic autorefraction using a portable autorefractor was performed. An IOL with power calculated before surgery then was implanted. In each eye, postoperative refraction was obtained. The IOL power that would have achieved emmetropia was calculated retrospectively. Aphakic autorefraction readings obtained during surgery were used to calculate the aphakic spherical equivalent (SE). The 2 formulas incorporating aphakic SE were applied to calculate the target IOL power. Comparison then was made to determine the accuracy of the formulas. A difference (referred to as IOL difference) was calculated by subtracting the adjusted emmetropic IOL power determined by postoperative refraction from the emmetropic IOL power calculated by the...Continue Reading

References

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Apr 28, 2009·Journal of Cataract and Refractive Surgery·Wolfgang Haigis

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Citations

Nov 15, 2011·Current Opinion in Ophthalmology·Afsun Sahin, Pedram Hamrah
Feb 20, 2016·The British Journal of Ophthalmology·Jan O HuelleStephan J Linke
Dec 15, 2020·Journal of Cataract and Refractive Surgery·Stefan GeorgievOliver Findl

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