Nowadays, the accurate calculation of the intraocular lens (IOL) power is essential in a context of refractive cataract surgery, and it is based on increasingly reliable non-contact biometers [1]. Optical biometers have shown their superiority over ultrasonic biometers in recent years [2], [3]. Today, the next-generation optical biometers use the swept-source optical coherence tomography (SS-OCT) technology while the previous non-contact generations used the optical principle of interferometry. Both technologies seem to be comparable with an advantage for the SS-OCT technology for the calculation of the axial length (AL), especially in case of subcapsular cataract [4], [5], [6]. The SS-OCT technology allows checking fixation on an OCT image of the macula, which has also facilitated task delegation.

Two SS-OCT biometers are of interest: the IOLMaster 700® (Carl Zeiss Meditec AG, Jena, Germany), the first to be marketed in 2014, and the Anterion® (Heidelberg Engineering GmbH, Heidelberg, Germany) recently marketed in 2019. The OCT source of the IOLMaster 700® has a wavelength of 1,055 nm with a scanning depth range of 44 mm and a resolution close to 5 μm. It provides a cross-sectional image of a small central macular area to testify the patient's fixation during data capture. The source of the Anterion® has a wavelength greater than 1300 nm with a scanning depth range of 32 mm and a resolution <10 μm.

The aim of this study was to compare the ocular biometric measurements obtained with these two biometers but also to compare the IOL calculation before cataract surgery and the postoperative predictability of the spherical equivalent (SE) one month after surgery calculated with the SRK/T formula.