Cataract surgery is a procedure to remove the cloudy lens and implant a clear artificial lens. The popularization and promotion of cataract surgery has enabled the majority of patients to see again, greatly improving the quality of life and avoiding the occurrence of accidents such as falls caused by poor vision. However, there are some people who have unsatisfactory results after surgery. The reasons for this are as follows: 1. Combined corneal scar, corneal endothelial lesion, severe dry eye and other lesions 2. Retinal hemorrhage and exudation caused by diabetes, hypertension, severe renal insufficiency or even uremia and other systemic diseases 3. Macular lesion, including hemorrhage, edema, exudation, scar, fissure and other conditions 4. Retinal hemorrhage, atrophy, etc. 5. Glaucoma, ocular trauma, intracranial lesions, etc. damage the optic nerve function 6. congenital combined amblyopia, nystagmus, etc. 7. retinal pigment degeneration after retinal detachment repositioning 8. myopia, hyperopia, astigmatism, etc. affect vision after surgery. The post-operative vision is affected by many factors. If conditions allow, a detailed pre-operative eye examination can roughly determine the post-operative vision recovery within the visible range, so that doctors and patients can reach a common understanding of the post-operative vision expectation.