Acquisition Time for Swept-Source Optical Biometry Plus Corneal Power Measurement During Cataract Evaluation

Abstract

Purpose: To compare the acquisition time necessary to obtain the optical biometry plus corneal power measurement using the IOLMaster 700 with central topography with that found using the standard IOLMaster 700 in combination with two corneal topographers, when acquiring biometry measurements during cataract evaluation.

Methods: This prospective, observational, controlled study included 96 eyes of 96 cataract patients. Acquisition times were registered for different conditions: time required for one complete measurement with IOLMaster 700 with central topography, time required for one complete measurement with standard IOLMaster 700 (without central topography), time required for one complete measurement with standard IOLMaster 700 plus time required for one complete measurement with Cassini, and time required for one complete measurement with standard IOLMaster 700 plus time required for one complete measurement with Pentacam HR. In addition, the agreement between keratometry (K), total keratometry (TK) and equivalent K reading (EKR) parameters using the three devices was performed.

Results: The post hoc Tukey's test revealed that there were statistically significant differences for all pairwise comparisons (p < 0.001) except for the acquisition times of the IOLMaster with central topography and the standard IOLMaster 700 (p = 0.501). The acquisition time by the IOLMaster 700 with central topography takes approximately three less times than the use of a corneal topographer combined with a biometer. The agreement of K1, K2, TK1, TK2, EKR1 and EKR2 measurements between the three devices revealed statistically significant differences for all possible comparisons (p < 0.001) except for the comparison between the IOLMaster 700 and the Cassini for all parameters (p > 0.05).

Conclusion: We consider that this is an efficient procedure that improves clinical flow. We also conclude that K readings obtained with the three devices cannot be used interchangeably since there are clinically relevant differences that may affect cataract surgery outcomes.

Keywords: IOLMaster 700; Scheimpflug imaging; cataract; color LED; optical biometer.

Conflict of interest statement

The authors report no conflicts of interest in this work.

© 2022 Ruiz-Mesa et al.

Figures

Figure 1

Bland-Altman plots obtained showing the mean difference versus average for the comparison between the different devices for K1 and K2. Mean (continuous line), lower and upper limits of agreement (±1.96SD, standard deviation, peripheral dotted lines) and lower and upper confidence intervals (95%) are depicted.

Figure 2

Bland-Altman plots obtained showing the mean difference versus average for the comparison between the different devices for TK1, TK2, EKR1 and EKR2. Mean (continuous line), lower and upper limits of agreement (±1.96SD, standard deviation, peripheral dotted lines) and lower and upper confidence intervals (95%) are depicted.