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Comparing the Lenstar optical biometer and the Verion image-guided system for intraocular lens power calculation

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Session Details

Session Title: Presented Poster Session: IOL Power Calculation/Paediatric

Venue: Poster Village: Pod 1

First Author: : M.Lee MALAYSIA

Co Author(s): :    Y Lee              

Abstract Details

Purpose:

To compare the keratometry(K) and white-to-white(WTW) measurements obtained from the Lenstar optical biometer(LS) with those from the Verion Image Guided System(VR) and their effect on intraocular lens(IOL) power selection.

Setting:

Lee Eye Centre, Ipoh, Malaysia

Methods:

60 eyes of 51 patients going for cataract surgery had biometry measurements and IOL calculation with the LS. Axial length from LS was used together with K and WTW measurements (from VR) for IOL calculation as well. IOL selection was done using the Barrett Universal II formula targeting emmetropia. The Prediction Error(PE), i.e. difference between the final spherical equivalent(SE) at 1 month follow up and the target SE, the PE within 0.25D, 0.5D and 1D of target and the Mean Absolute Error(MAE) was calculated for both the LS and VR.

Results:

K measurements from the VR were closely correlated with the LS (Pearson correlation coefficient K1, r=0.958; K2, r=0.952) but the steep axis and WTW were less so (Axis, r=0.670; WTW, r=0.195). The MAE was 0.317 and 0.347 for LS and VR respectively. PE within 0.25D was 48.3% and 40%, within 0.5D was 83.3% and 76.7% and within 1D was 98.3% and 96.7% for LS and VR respectively. There was no statistically significant difference in MAE between the LS and VR (p=0.74)

Conclusions:

Using the K and WTW measurements from the Verion Image Guided System for IOL power calculation did provide comparable results with the Lenstar. However, the Lenstar did provide better prediction accuracy with a higher proportion of eyes achieving predicted target.

Financial Disclosure:

NONE

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