Accuracy of Different Intraocular Lens Calculation Formulas in Patients with High Axial Myopia

Abstract

Cataract surgeons dedicate a significant portion of their preoperative workflow towards performing IOL calculations, picking a formula, and selecting the most appropriate lens power to implant into a given patient’s eye. This may be a challenging and time-consuming process for many surgeons given the number of formulae and factors to consider with each eye. Since there has not been a single perfect IOL formula or solution which can help to simplify this complex process, surgeons have always relied on using multiple IOL formulae and picking one which they feel will suit their needs. Expectations from cataract surgery remain high from both patients and surgeons. Current IOL calculation formulae generally perform well for average eyes. However, due to the mathematical and biometric imperfections, these formulae remain suboptimal in eyes with atypical values of axial length, keratometry and anterior chamber depth. Several new IOL formulae have been developed in the past decade which have sought to improve post-operative outcomes by introducing additional variables and incorporated advanced