Clinically, there is no such thing as which is better, ultrasonic emulsification or femtosecond cataract treatment. The principle of action and treatment effect of the two are different, and it is recommended to choose according to the actual situation under the guidance of the doctor. 1. Principle of action: ultrasonic emulsification is the use of ultrasound energy to emulsify the lens, and then sucked out of the eye, so as to achieve the purpose of treating cataract. Femtosecond treatment is the process of breaking up the lens by means of laser pulses and then sucking it out before implanting an artificial lens. 2. Treatment effect: Femtosecond treatment can better optimize the position and refractive status of the IOL, thus improving the accuracy, safety and effectiveness of cataract surgery. The surgical incision of ultrasonic emulsification is smaller, which can effectively reduce the damage to the cornea. It is recommended to choose ultrasonic emulsification or femtosecond treatment under the guidance of a doctor according to the actual situation, and not to choose blindly on your own to avoid discomfort.