Refractive error, posterior cataract and other sequelae may occur after cataract implantation. The probability of cataract sequelae is generally small, and if discomfort occurs after surgery, corresponding treatment can be taken according to the specific disease. 1. Refractive error: After implantation of IOL in cataract surgery, affected by the material of the lens, monofocal or multifocal, it may cause parallel rays of light to enter the eyeball at different meridians with different refractive rays, which cannot be gathered at one point, so refractive error may be considered to be solved by replacing the lens. 2. Posterior cataract: It may be caused by the clouding of the posterior capsule membrane of the lens after the operation, and generally there will be symptoms such as vision loss, blurred vision, refractive changes, etc. Laser treatment can generally eliminate. The sequelae of cataract implantation varies from person to person. After the operation, you should pay attention to regular review, good eye care, and do not be negligent to reduce the occurrence of sequelae.