Comparison of toric intraocular lens calculation with the integrated K method and three single biometric devices
Yachana Shah1, Angela Jacques, Lior Or
1From the Sir Charles Gairdner Hospital, Perth, Australia (Shah, Or); Lions Eye Institute, Perth, Australia (Shah, Or, Barrett); Institute for Health Research, The University of Notre Dame, Perth, Australia (Jacques); Department of Research, Sir Charles Gairdner Hospital, Perth, Australia (Jacques); Centre for Ophthalmology and Visual Science, University of Western Australia, Perth, Australia (Barrett).
Purpose:
To compare astigmatic outcomes using the Integrated K method and anterior surface keratometry from 3 different biometric devices.
Setting:
Lions Eye Institute, Perth, Australia.
Design:
Retrospective case series.
Methods:
Eyes of patients who underwent uneventful cataract surgery were analyzed. Predicted postoperative astigmatism was calculated for Integrated K method, IOLMaster 700, Lenstar and Pentacam. The mean centroid error in predicted postoperative refractive astigmatism (PE), mean absolute PE and percentage of eyes within 0.5 diopter (D), 0.75 D and 1 D of absolute magnitude of PE were compared. A subset analysis was done where the difference in cylinder magnitude between the 2 methods was more than 0.25 D. Spherical prediction outcomes were also analyzed.
Results:
241 eyes of 139 patients were included in the study. The mean centroid PE of Integrated K method (-0.07 @ 69) was significantly different from IOLMaster and Pentacam. The mean absolute PE with Integrated K method (0.33 ± 0.17) was significantly lower than all 3 devices. The percentage of eyes within 0.5 D and 0.75 D of absolute magnitude of PE was 82% and 99% for Integrated K method, 76% and 95% for IOLMaster and Lenstar, and 60% and 86% for Pentacam. In the subset analysis, the improvement in accuracy of the Integrated K method compared with a single device was greater in terms of the percentage of eyes predicted within 0.5 D. The Integrated K method did not impact the spherical prediction outcomes.
Conclusions:
The integrated K method is more accurate and precise than anterior surface keratometry from a single biometric device.
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