Posters

Evaluation of aphakic refraction technique for secondary intraocular lens power calculation in children

Poster Details

First Author: M.Jafarinasab IRAN

Co Author(s):    B. Khosravi   M. Yaseri   H. Hasani        

Abstract Details

Purpose:

to evaluate the refractive formula for IOL power calculation in secondry IOL implantation in children

Setting:

Ophthalmic Research Center, labbafinejad medical center, Shahid Beheshti University of Medical Sciences, tehran Iran

Methods:

33 eyes of children between 3-14 years old who had been underwent  lensectomy due to congenital cataract and were candidates for secondary intraocular lens implantation  were enrolled in this study.autorefraction and lenstar was performed before surgery to calculate preoperative aphakic spherical equivalent(SE).and secondary IOL power by conventional formulas (SRK-T and holladay) .IOL was implanted for all patients. postoperative refraction was obtained.the IOL power that would have achieved target refraction were calculated.retrospectively.IOL power difference was calculated by subtracting this target refraction from IOL power calculated by the 2 formulas using aphakic SE(lanchulev and leccisotti ) and conventional formulas.

Results:

After surgery, 40% of eyes were within -1.00 to +1.00  diopters.and 66% were within -2.00 to +2.00 diopters Lanchulev formula in all eyes (except one eye) and leccisotti formula in all eyes led to myopia(mean -4.3 diopter myopia for lanchulev and -8.70 diopter for leccisotti). using data and with reduction the coefficient of lanchulev formula,we derived alternative formula that was comparable with conventional formulas (our formula:IOL power=aphakic SEₓ1.7)

Conclusions:

although Based on previous studies in adults lanchulev formula can be applied to most eyes and leccisotti formula shows good performance in myopic eyes,but based on our study in children both formulas lead to significant postoperative myopia.but the new alternative formula reported in our study is comparable with conventional formulas in children and can be used when we can not use conventional formulas in children. FINANCIAL INTEREST: NONE