New IOL-calculation formula using corneal asphericity

Session Details

Session Title: Presented Poster Session: Toric IOLs

Venue: Poster Village: Pod 1

First Author: : W.Whang SOUTH KOREA

Co Author(s): :    H. Kim                       

Abstract Details

Purpose:

To analyze the correlation between the corneal asphericity measured by Scheimpflug rotating camera and ELP and develop new IOL formula using the corneal asphericity measured by Scheimpflug rotating camera

Setting:

Yeouido St.Mary hospital, The catholic university of Korea

Methods:

This study is retrospective chart review. Partial coherence interferometry (IOLMaster, Zeiss, Germany) and Schiempflug rotating camera (Pentacam, Oculus, Germany) were used in 105 eyes (55 right eyes, 50 left eyes)  Mean age was 67.4 ± 9.1 years (48 ~ 83) After implantation of AMO ZCB00 1-piece IOL, refractive outcomes measured by automated refraction at 3 months postoperatively and ELP was back-calculated by vergence formula. ELP prediction equations were developed by multiple linear regression tests. ELP prediction error, mean prediction error (Actual SE – Predicted SE), mean absolute error were calculated for evaluating predictive accuracy.

Results:

The combination of Axial length, central corneal power and Q value showed highest adjusted R square value (0.77). It produced smallest standard deviation in both ELP prediction error and mean prediction error. Mean absolute error was also smallest in the combination of Axial length, central corneal power and Q value.

Conclusions:

The combination of axial length, central corneal power and corneal asphericity showed the highest correlation with the effective lens position(ELP). New IOL calculation equation including corneal asphericity at 9.0 mm enhanced the predictive accuracy for IOL power calculation.

Financial Disclosure:

None