Innovative Toric Iol Calculators and How to Use Them

By Noel Alpins, FRANZCO, FRCOphth, FACS The ASSORT Toric Calculator offers unique features, designed for accuracy and functionality, that are not available on other calculators provided by implant companies or private groups. Its primary unique feature is the ability to calculate the most effective implant (sphere and toricity) available from all companies worldwide and compare IOLs based on the target spherocylindrical refraction that is calculated to remain postoperatively (Figure 1). The user can do this in a universal generic calculation without having to visit several separate corporate websites, some of which have inaccuracies of varying origins.1 With the ASSORT Toric Calculator, accuracy is achieved by using calculations that parallel those of popular laser interferometry biometers, and the software also includes optimized lens constants for commonly used formulas, such as Hoffer, Haigis, Holladay, and SRK/T, to obtain the effective lens position (ELP). Other parameters used in the calculations include INNOVATIVE TORIC IOL CALCULATORS AND HOW TO USE THEM