Ray-tracing intraocular lens power calculation using anterior segment optical coherence tomography measurements

Abstract

The accuracy of the ray-tracing IOL power calculations using AS-OCT data was comparable to that of the conventional formula and minimized the effect of corneal eccentricity and posterior corneal curvature.

Use of Scheimpflug corneal anterior-posterior imaging in ray-tracing intraocular lens power calculation

“…The ray tracing was performed at 2.5 mm pupil diameter, so that impact of the reduced measurement area on accuracy in the PCC and asphericity calculations was not critical. The use of AS‐OCT topography would be more effective to avoid this issue (Minami et al. 2012).…”

Corneal Power Measurement Obtained by Fourier-Domain Optical Coherence Tomography

“…Previous studies have shown that corneal power measurements obtained by this instrument have good intraoperator repeatability, 8 are similar to those obtained by automated keratometry (IOL-Master, Carl Zeiss Meditec, Germany) in virgin eyes, 8 and can be used to calculate the intraocular lens power. [9][10][11] In addition, they are obtained faster than those obtained with time-domain OCT. 12 However, several issues have not yet been investigated, such as the interoperator reproducibility of the corneal power values obtained by FD-OCT and agreement of these values with those obtained by Scheimpflug imaging. Moreover, because FD-OCT can measure the corneal power in reference to either the pupil center or the corneal vertex, further research is required to assess any difference between these measurements.…”

Predicting the Postoperative Intraocular Lens Position Using Continuous Intraoperative Optical Coherence Tomography Measurements

“…OCT measurements for IOL power calculation were used in the past, but only for preoperative measurements, and results were shown to be similar to those obtained with the optical device (Carl Zeiss Meditec AG) when using the SRK/T IOL power formula. 21 Concerning intraoperative measurements, two different technologies were used for IOL power calculation recently: intraoperatively performed autorefraction showed to implicate several problems, such as alignment problems, because the patients couldn't see the fixation target and the use of OVDs made measurements impossible. 22 The second more recently introduced technology is intraoperatively measured wavefront aberrometry.…”