Moderate cataract, a usually need surgical treatment, commonly used surgical methods are ultrasonic emulsification cataract aspiration, cataract extracapsular extraction, femtosecond laser-assisted cataract extraction, IOL implantation and so on. 1. Ultrasonic emulsification cataract aspiration: By applying ultrasound energy, the cloudy lens nucleus and sebum will be emulsified and then aspirated, preserving the posterior capsule of the lens, which reduces tissue damage and postoperative corneal astigmatism. 2. Extracapsular cataract extraction: the cloudy lens nucleus and cortex are removed and the posterior capsule is preserved, which reduces the interference and damage to the intraocular structures and creates conditions for the smooth implantation of posterior chamber IOL. 3.Femtosecond laser-assisted cataract extraction: Ultra-short pulse laser is used to assist the treatment, which increases the precision of the surgery and reduces the surgical damage. 4. IOL implantation: IOLs are generally divided into anterior chamber and posterior chamber according to the location of implantation in the eye, and are divided into hard and soft according to the manufacturing materials, all of which are polymers with good optical and physical properties and histocompatibility. It is recommended that cataract patients go to a regular eye hospital, under the guidance of the doctor for relevant examinations, according to the patient’s specific examination results, follow the doctor’s instructions for targeted treatment, pay attention to eye hygiene, avoid prolonged eye use.