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Comparison of newer IOL power calculation formulae with conventional ones in highly myopic eyes

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Session Details

Session Title: Cataract Surgery Outcomes: IOL Power Calculations

Session Date/Time: Sunday 08/10/2017 | 14:30-16:00

Paper Time: 15:42

Venue: Meeting Center Room I

First Author: : S.Vasavada INDIA

Co Author(s): :    V. Vasavada   V. Vasavada   S. Srivastava   A. Vasavada           

Abstract Details


To evaluate the predictive accuracy of newer formulae (Barrett Universal II and Hill RBF calculator) to conventional ones (SRK/T, Holladay 1, Hoffer Q) in high myopic eyes.


Iladevi Cataract & IOL Research Centre, Raghudeep Eye Hospital, Gurukul Road, Memnagar, Ahmedabad - 380052


Prospective, observational study in 30 eyes(30patients) undergoing cataract surgery with monofocal IOL implantation and having an axial length >26mm. Eyes with optical biometry were included, and those with staphyloma excluded. Prediction Error(PE) was calculated as(predicted refraction- actual postoperative refraction)and absolute PE(APE)=│predicted refraction-actual postoperative refraction│. Best corrected visual acuity (BCVA) and manifest refraction assessed between 3-4 months postoperatively and PE, APE compared between all four formulae.


Ongoing study, results will be updated. Early results :Mean age of patients was 61.2+5.4years.The mean(+standard deviation,SD)PE was 0.05+0.26,-0.48+0.31,-0.19+0.30 and 0.10+0.20 diopters(D) with SRK/T,Holladay I, Hoffer Q and Barrett formula respectively (RBF formula results pending). Difference in mean PE between the formulae was statistically significant (P<0.0001). SRK/T and Barrett formulae had the least PE. APE was 0.20+0.13,0.48+0.31,0.39+0.15 and 0.19+0.07D with the four formulae respectively.


In eyes with an axial length >26mm, the SRK/T and Barrett formulae seemed to give best prediction results based on preliminary data (RBF formula results pending). Final conclusion will be updated based on results of ongoing study.

Financial Disclosure:


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