The early symptoms of cataract are diminished vision; overlapping of what is seen; black dots or streaks of shadow in front of the eyes; decreased contrast sensitivity under strong light and glare under headlights at night; and refractive changes, such as reduction of original presbyopia and increase of myopia. Cataracts are mostly seen in middle-aged and elderly people over 40 years old and increase with age. The cause of cataracts is related to slow metabolic degeneration in the elderly, and some people think it is related to long-term exposure to sunlight, endocrine disorders, metabolic disorders and other factors. Regarding how to diagnose the early symptoms of cataract, if you are diagnosed with cataract, you must pay high attention to it. Although generally cataract is painless, if it is not treated in time, vision will be seriously reduced or even blinded. Cataracts are the world’s number one blindness-causing eye disease and should not be ignored. Up to now, there is no drug that has a complete cure for cataracts. The only way to treat cataracts is surgery. With the popularization of cataract ultrasound-emulsification IOL implantation, its advantages of small incision, less tissue damage, short operation time and fast vision recovery have enabled more cataract patients to regain their sight. Warm tip: If you notice any of the above conditions, please go to the hospital in time for consultation and treatment.