Cataract surgery evolved dramatically from a simple procedure of removing the clouded crystalline lens to a method that additionally aims to correct all refractive errors, allowing a perfect restoration of the visual function with high levels of spectacle independence.
Astigmatism is a meridian-dependent refractive error, which is found in most human eyes.A large proportion of patients with cataract have corneal astigmatism ranging from 0.75 to 2.00 diopters (D).
Nowadays, implanting toric intraocular lenses (IOLs) remain the most common procedure to treat pre-existing corneal astigmatism during phacoemulsification.
Ocular biometric measurements are crucial in the calculation of IOL power before cataract surgery. Optical biometry has been demonstrated to be more accurate and safer than ultrasonic biometry, which is likely accompanied by the risk of infection and indentation due to contact measurement. Among optical biometric devices, there are the Lenstar LS 900, based on optical low-coherent reflection and IOLMaster 700, based on SS-OCT. The later has an advantage of measuring the Total keratometry using SS-OCT.