Impact of Crystalline Lens Opacification on Effective Phacoemulsification Time in Femtosecond Laser–Assisted Cataract Surgery

"2 In general, metrics for ultrasound phacoemulsification such as percentage phaco power, EPT, and CDE remain proprietary and unique to each manufacturer, much as they were over a decade ago, when it was written that "Although outcomes such as slit lamp examination and visual acuity may be fairly represented as comparative, we caution against using EPT and average power for drawing conclusions about the relative efficiency of different phaco machines... Because manufacturers may use different algorithms to calculate these quantities, comparison among different machines remains fraught with difficulty.