At the ESCRS 2018 in Vienna, Oculus is introducing the advanced Barrett Toric calculator, including the posterior cornea, and the Olsen ray-tracing formula, within the IOL calculator of the Pentacam AXL. Both formulas are available to all Pentacam AXL users in a free software update.
The new Barrett Toric calculator takes now measurements of the posterior cornea surface into account, making it an advancement of the known and proven Barrett Toric calculator, which estimates the influence of the posterior surface. The benefit of considering the posterior cornea in toric IOL calculations is primarily for corneas with oblique astigmatism or astigmatism against the rule.
The Olsen formula is based on a ray-tracing approach. It uses the anterior and posterior corneal data, corneal thickness, ACD, and axial length to calculate a unique model of the patient’s eye. IOL power is then calculated from the IOL geometry rather than an IOL constant. The big advantage of the Olsen formula is its universal approach. IOL power calculation is possible for virgin corneas as well as for altered corneal shapes of many aetiologies, such as post-refractive, keratoconus, corneal transplants etc.
Spherical, aspheric, multifocal, and toric IOLs are already incorporated in the IOL database of the IOL Calculator. The data of the implanted IOL as well as the post-op refraction can be stored with a few clicks.
The IOL Calculator software includes numerous other IOL formulas besides those mentioned above: the Barrett Universal 2, Hoffer Q, Holladay I, SRK/T and Haigis as standard formulas, Savini toric using TCRP, HillPotvinShammas (after myopic LASIK), HillPotvin (after RK), Barrett True K and the double-K method (SRK/T, Hoffer Q Holladay1) for post-refractive eyes. The Holladay IOL consultant software, OKULIX (ray tracing) and many others can also be linked to the software.
The Pentacam AXL offers software links to the Avedro KXL2 and its Mosaic software for customized CXL-treatments, to the LENSAR Femtosecond laser and to the Leica Proveo microscope.
For more information, contact your local distributor or visit booth B404 at ESCRS in Vienna.