Acquisition Time For Optical Biometry Plus Corneal Power Measurement During Cataract Evaluation

The purpose of the present study was to compare the acquisition time necessary to obtain the optical biometry plus corneal power measurement using the IOLMaster 700 with central topography (IOLMaster 700+CT) with that found using the standard IOLMaster 700 in combination with two corneal topographers: the Pentacam HR Scheimpflug camera and the Cassini color LED.

Oftalvist, Jerez de la Frontera, Spain

This study included 96 eyes of 96 cataract patients, and was approved by the Ethics Committee CEIM Hospital Clínico San Carlos (Spain) and registered at clinicaltrials.gov (NCT04875247). Acquisition times were registered for different conditions: 1) time required for one complete measurement with IOLMaster 700+CT, 2) time required for one complete measurement with standard IOLMaster 700, 3) time required for one complete measurement with standard IOLMaster 700 plus time required for one complete measurement with Cassini, and 4) time required for one complete measurement with standard IOLMaster 700 plus time required for one complete measurement with Pentacam. In addition, the study assessed the agreement for K1, K2, TK1, TK2, EKR1 and EKR2.

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 700+CT and the standard IOLMaster 700 (p = 0.501). The acquisition time by the IOLMaster 700+CT takes approximately 3 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 3 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).

Our study shows that the acquisition time by the IOLMaster 700+CT takes approximately 3 less times than the use of a corneal topographer combined with a biometer. We consider that this is an efficient procedure that improves clinical flow. We also conclude that K readings obtained with the 3 devices cannot be used interchangeably since there are clinically relevant differences that may affect cataract surgery outcomes.