Doing laser surgery for posterior cataract may have the risk of damaging the IOL, causing iris hemorrhage, and causing eye inflammation. 1. Damage the artificial lens: the laser mainly penetrates the crystal to open the cloudy posterior capsule membrane of the lens, which may leave a smaller laser spot on the surface of the crystal, thus damaging the artificial lens. 2. Causing iris hemorrhage: laser treatment may hit the iris or iris blood vessels, which may cause iris hemorrhage. 3. Causing eye inflammation: The laser pulverization process may cause pulverized particles to enter into the anterior chamber, causing clouding of the anterior chamber, leading to occlusion of the atrial angle causing increased intraocular pressure, or causing mild inflammation of the eye. After cataract surgery or lens trauma, the residual cortical or lens epithelial cells proliferate and form clouding, which is called posterior cataract, or posterior cataract for short. It is the most common complication after cataract surgery. Any surgery carries some risk. It is recommended that patients with posterior cataract, try to go to a regular hospital, choose a professional doctor to perform laser surgery, and have regular postoperative checkups to reduce the risk of surgery.