Before implantation the correct lens power needs to be determined. The process of measuring the various anatomical characteristics of the eye that are needed for IOL power calculation is called ocular biometry. Optical biometry, also known as ophthalmic biometry, using partial coherence interferometry has become the gold standard in ocular biometry as it is highly accurate, easy to perform, non-invasive and comfortable for the patient. The accuracy of optical biometry, and in particular the Lenstar and IOL-Master, have been extensively confirmed across a wide range of scientific studies.
The use of optical biometry is a valuable tool when planning cataract surgery, resulting in optimization of patient outcomes.
Ocular biometry involves anatomical measurements of the eye, including the axial length (AL), keratometry and anterior chamber depth (ACD) and includes anterior segment biometry, for which only the front third of the eye is measured. These biometric measurements are crucial for the selection of the correct IOL power in order to achieve the desired refractive outcome after cataract surgery.1 Therefore, ocular biometry is an essential step before cataract surgery. There are currently two procedures available: ultrasound and optical biometry. Due to certain disadvantages of ultrasound biometry, optical biometry has become procedure of choice in ocular biometry.
Ultrasound biometry is an invasive procedure that requires direct contact with the cornea and the use of anesthetics, both of which can be uncomfortable for the patient. Moreover, this measurement method requires significant training for the examiner in order to avoid errors due to excessive compression of the ultrasound probe on the cornea. Ultrasound biometry also requires adjustment of the ultrasound speed when different media and/or optical conditions are present, e.g. pseudophakic eyes and silicone oil.
While the introduction of optical biometry revolutionized cataract surgery in the late 1990s, Haag-Streit is writing the latest chapter in biometry history with Lenstar.
Lenstar provides highly accurate laser optic measurements for every section of the eye − from the cornea to the retina. With its integrated Olsen formula and the optional Toric Planner featuring the Barrett Toric Calculator, Lenstar supplies the user with latest technology in IOL prediction for any patient.
Lenstar simultaneously provides laser interferometric biometry of the entire eye, precise keratometry, astigmatism and axis measurement, WtW and pupillometry simultaneously in a single measurement.
EyeSuite IOL features cutting-edge multivariable IOL formulae for improved refractive outcomes.
The ZEISS IOLMaster® 500 is the gold standard in optical biometry with more than 100 million successful IOL power calculations to date. With the new version of the ZEISS IOLMaster 500 you get a piece of cutting-edge technology that points the way to the future of optical biometry.