We often hear that elderly people do not understand or fear that cataracts will occur again after cataract surgery or even do not want to have the first surgery because of this. After cataract removal, the epithelial cells in the residual lens capsule will slowly proliferate and form transparent pearl-like vesicles mixed with the lens capsule membrane, gradually forming a mechanized membrane with reduced transparency, called posterior cataract, or posterior cataract for short. After the formation of posterior cataract, the clarity of vision of patients will gradually decrease, and patients will find that the intensity of light will affect the visual effect. After a few moments, the original vision is restored.