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Piggy back IOLs: treating rest refractive errors after MFIOL implantation

Poster Details

First Author: R.Potvin NORWAY

Co Author(s):    K. Gundersen              

Abstract Details


To study accuracy, efficacy and safety using Rayner Sulcoflex IOL to correct for rest refractive errors after MFIOL implantation.


Single ophthalmology clinic.


53 eyes of 29 subjects were recruited to this retrospective study. Study subjects were examined preoperative, day 1, week 1, month 1 and 3 after planned Piggy bag implantation. 5 eyes received non toric lenses, whereas 48 eyes received toric piggy bag lenses. Preoperative piggy bag biometry aimed at -0.25 as the final refractive error. Study protocol included manifest refraction, uncorrected and best corrected visual acuity.


Preoperative Mean Spherical Equivalent (MSE) was 0.054 D ± 0.645 D ranging from -1.75 to +1.0 D. At Month 3 Mean Spherical Equivalent (MSE) was -0.243 D ± 0.302 D ranging from -0.75 to +0.25 D. Preoperative cylinder was 1.127 ± 0.547 D ranging from -2.75 to 0 improving to -0.525 ± 0.323 D ranging from -1 to 0. Preoperative UCVA was 0.626 ± 0.184 D ranging from 0.2 to 1.0 improved to 0.907 ± 0.124 D ranging from 0.7 to 1.1 at 3 months post operative. Safety index increased from 0.99 at Day 1 to 1.02 at Month 3.


A majority of the subjects that might need reoperations due to rest refractive error are aged 50 or older. In this age gropup, laser treatment is not the ideal method due to dry eye, suboptimal wound healing etc. Furthermore, the most frequent post MFIOL rest refractive error was a rest cylinder, which may be more difficult to correct with laser treatment. Piggy bag implantation proved to be a safe, effective and accurate method to correct for rest refractive errors after MFIOL implantation and was well accepted in this study. We observed a low rate of complications among the study subjects.

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