Cataracts are the leading cause of blindness. The causes of cataracts are many and varied, and surgery is the best way to treat cataracts. In our clinical work, we have found that there are two major misconceptions about the timing of surgery: Misconception 1, cataracts should wait until they are mature, and then do it again The old view is that cataracts should wait until the visual acuity drops to below 0.1 before doing surgery. This has several disadvantages. First, as cataracts continue to worsen, the damage to many tissues in the eye, such as the corneal endothelium, the suspensory ligament of the crystalline lens, the iris tissue, etc., will be increased, and the chances of postoperative complications will increase. Secondly, for patients with narrow atrial angle and the possibility of closed angle glaucoma, there is a possibility of inducing an acute attack of glaucoma during the process of cataract expansion. Once the acute attack occurs, there will be iris atrophy, corneal endothelial damage, posterior iris adhesion and other changes, which will seriously affect the effect of cataract surgery. Therefore, cataract should not wait until the visual function drops to a very low level before doing surgery. Myth 2: The earlier the cataract is done, the better it is. Human crystals are able to see far as well as near through adjustment. Although artificial lenses have been developed rapidly in recent years, they are far from being comparable to human crystals in terms of adjustment amplitude, adjustment speed and imaging quality. At the same time, in the early stage of cataract, the crystal only shows refractive changes due to volume expansion, which simply means that the patient can get good vision by wearing glasses. Therefore, it is not advisable to blindly pursue early surgery while ignoring the possible drawbacks that may occur after surgery. There is no fixed pattern for the timing of cataract surgery. For a patient with a narrow atrial angle and a high demand for quality of life, early surgery with a visual acuity of 0.5-0.6 can prevent glaucomatous episodes and at the same time improve the quality of life; for a patient who is accustomed to wearing lenses, engaging in general work, and does not have a high demand for visual function, the patient can first adjust his/her refractive status, and then consider surgery according to the development of the lesion. In this process, it is necessary for both patients and doctors to have a full understanding of the disease and good communication. Can a cataract in one eye be passed on to the other eye? Cataracts are caused by the aging of the lens. Their development is gradual and both eyes are symmetrical, so a cataract in one eye will occur in the other eye as well, just to a different degree. Can cataracts be prevented? Until now, there has been no way to prevent cataracts from developing, but we do know that some factors can speed up the development of cataracts. These factors include ultraviolet light exposure, smoking, alcohol consumption, the use of drugs such as steroids, and diseases such as diabetes. Therefore, it is important to avoid these factors in your daily life to slow down the progression of cataracts. What happens if cataracts are left untreated? Cataract progression to a certain extent can seriously affect vision and even blindness. How long does it take to recover from cataract surgery? It usually takes about 1-3 months to fully stabilize after surgery. During this period, you should take medication on time and have regular checkups; make sure your eyes are rested and not overly fatigued; keep your eyes clean; and avoid accidental impacts and strenuous exercise.