Interchangeability between Pentacam and IOLMaster in Phakic Intraocular Lens Calculation

Abstract

Purpose To evaluate the agreement and interchangeability between IOLMaster and Pentacam in phakic intraocular lens (IOL) calculations. Methods This was a prospective study involving measurement of the anterior segment parameters anterior chamber depth (ACD), white to white (WTW) line, and average anterior corneal curvature (K-reading) on 108 healthy eyes of 56 consecutive patients. Interdevice agreement and interchangeability in phakic IOL calculations was evaluated. Results Pentacam measured significantly longer ACD measurements (3.54 ± 0.35 mm) than the IOLMaster (3.40 ± 0.37 mm) (p<0.0001); on the other hand, it measured significantly shorter WTW line measurements (11.61 ± 0.44 mm) than the IOLMaster (11.66 ± 0.42 mm) (p = 0.016). No difference was found regarding the average K-readings. For biometry and phakic IOL power calculation, there was no clinically significant difference between the devices, but for phakic IOL diameter calculation the difference was clinically significant. Conclusions There is a good agreement in ACD and K-readings between Pentacam and IOLMaster, making them interchangeable in biometry and phakic IOL power calculation, but they are not interchangeable regarding WTW line measurement; the difference will affect the phakic IOL diameter, which would affect lens safety.