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