Intraocular Lens Calculations Using Intraoperative Wavefront Aberrometry, Partial Coherence Interferometry, and Low-Coherence Reflectometry

Monday, April 28, 2014: 3:16 PM
Room 150 (Boston Convention and Exhibition Center)
Bruna V. Ventura, MD, Altino Ventura Foundation, Recife, Brazil
Li Wang, MD, PhD, Baylor College of Medicine, Houston, TX, USA
Mitchell P. Weikert, MD, Baylor Eye Physicians & Surgeons, Houston, Texas, USA
Sumitra Khandelwal, MD, Baylor College of Medicine, Houston, TX, USA
Douglas D. Koch, MD, Cullen Eye Institue, Baylor College of Medicine, Houston, TX, USA

Narrative Responses:

Purpose
To compare the accuracy of intraocular lens (IOL) power calculations

using  intraoperative wavefront aberrometry, partial coherence interferometry

and optical biometry in normal eyes.

Methods
Prospectively, patients with normal eyes undergoing cataract

surgery were included. Predicted refraction for the implanted IOL power by the

Optiwave Refractive Analysis (ORA; WaveTec Vision Systems) was compared

to refractions predicted by the IOL Master (Carl Zeiss Meditec) and the Lenstar

LS900 (Haag-Streit AG) using the Holladay 1 formula. The refractive prediction

errors were determined by subtracting the 3-week postoperative refraction from

the predicted refraction. After adjusting the mean refractive prediction errors

to zero, the median absolute prediction error (MAE) and the percentage of eyes

with prediction errors within 0.50 and 1.00 diopters (D) were calculated.

Results
Preliminary data was analyzed (n = 11). The MAE was 0.13 D, 0.25 D,

and 0.12 D for the ORA, IOL Master, and Lenstar, respectively, and there were no

differences among devices (P>0.05). In 91% of cases, ORA had a prediction error

within ± 0.50 D, compared to 82% for IOL Master, and 91% for Lenstar. All eyes

(100%) were within 1.00 D of prediction error using the three devices.

Conclusion
CONCLUSIONS:  These devices had similar accuracy in IOL power calculations

in normal eyes,  and more patients are being enrolled and final results will be

presented.