In a prospective randomized study , conventional phacoemulsification with a @-mm clear corneal incision using a disposable keratome was performed in @ eyes of @ patients ( manual group ) , and femtosecond laser-assisted cataract surgery with a @-mm biplanar clear corneal tunnel created by a femtosecond laser ( LenSx ; Alcon Laboratories , Inc. , Aliso Viejo , CA ) was performed in @ eyes of @ patients ( femtosecond laser group ) .