Table 1.

IOL biometers categorized by technology.

Technology	PCI/OLCI/OLCR	Scheimpflug	SS-OCT
Instruments	IOLMaster 500 AL-Scan OA-1000 Lenstar LS900 Aladdin	Pentacam HR Galilei G4	IOLMaster 700 Argos OA-2000 ANTERION
Mechanism	Low or partial-coherence Interferometry with topography	Three-dimensional rendering of the anterior segment	High-resolution cross-sectional images of the eye
Advantages	Efficiency, accuracy	Detailed rendering, irregular corneas	Resolution, accuracy
Disadvantages	Limited parameters, limited detail or resolution	Cost, proper alignment	Cost

PCI—partial coherence intereferometry; OLCI—optical low coherence interferometry; OLCR—optical low coherence reflectometry; SS-OCT—swept source optical coherence tomography; IOLMaster 500 (Carl Zeiss Meditec, Dublin, CA, USA); AL-Scan (Nidek Co., Ltd., Gamagori, Japan); OA-1000 (Tomey, Nagoya, Japan); Lenstar LS900 (Haag-Streit, Koniz, Switzerland); Aladdin (Topcon Europe, Visia Imaging, San Giovanni Valdarno, Arezzo, Italy); Pentacam HR (Oculus, Wetzlar, Germany); Galilei G4 (Ziemer Ophthalmic Systems AG, Port, Switzerland); IOLMaster 700 (Carl Zeiss Meditec, Dublin, CA, USA); Argos (Movu, Santa Clara, CA, USA); OA-2000 (Tomey, Nagoya, Japan); ANTERION (Heidelberg Engineering GmbH, Heidelberg, Germany).