At present, patients suffering from cataract do not have to wait until they are blind before surgery, but according to the different needs of patients at different times of surgery, such as drivers, mechanics, do fine work on the vision requirements of the higher people can be in the vision down to 0.5-0.4 or so to do the operation, and the retired and the vision requirements of the patient is not generally in the 0.3-0.4 or so can also do cataract surgery. Cataract to wait until the eye blindness can be operated is a traditional saying, and cataract maturity when the volume of the lens expansion, often prone to glaucoma so that the condition worsens, so that the cataract eyes of the opportunity to regain sight lost. Some people with cataract in the long period of progress, but also often accompanied by other eye diseases such as chronic simple glaucoma, macular degeneration, uveitis, etc., not timely treatment will also make the opportunity to restore eye sight will be reduced. Cataract has been in the first place of modern eye disease blindness Some cataract patients gullibly believe in the traditional habit of “cataract to wait for the blind ripe before surgery” in the complete blindness before going to the hospital for surgery, so that the long-term vision loss process to the body and mind to bring great damage, often due to the inability to see the road fell into the limb fracture, but also due to the cataract ripe triggered by glaucoma and uveitis and other eye diseases caused by the cataract. The cataract is the first cause of blindness, and it is the most common cause of blindness. Cataract is the first cause of blindness. The causes of cataracts are many and varied, and surgery is the best treatment for cataracts. There are two common misconceptions about the timing of surgery. Myth 1: Wait until cataracts are ripe for surgery The old belief is that cataracts should not be operated on until the vision has deteriorated to the point where it is difficult to see a finger in front of the eye. This has several disadvantages. First, as cataracts continue to worsen, the damage to multiple tissues in the eye, such as the corneal endothelium, the suspensory ligament of the crystalline lens, and the iris tissue, will increase, 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 the cataract is. The human crystalline lens is 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 the human crystalline lens 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 disadvantages that may occur after surgery. What is the right time for cataract surgery Traditional cataract surgery often needs to wait until the cataract is mature and the vision cannot recognize the fingers in front of the eyes, but this is not necessary for the widely used cataract ultrasonic emulsification suction and folded IOL implantation, where the incision is only 1.5-2.8 millimeters. Instead, it is believed that surgery can be considered when the cataract has progressed to more than moderate levels and visual acuity is less than 0,5-0,3 or less. Surgery at this time, the lens nucleus is softer, ultrasonic nuclear fragmentation, emulsification, suction is easier, less damage, less astigmatism, postoperative reaction is light, and the patient does not have to go through a long period of visual dysfunction, which can greatly improve their work and quality of life. Geriatric cataract surgery time can be based on the patient’s life, work situation and the level of demand for vision to decide.” Therefore, seniors with cataracts should not wait to go blind and then delay the opportunity to regain their sight.