Minimally invasive technology With the application of computer technology in medicine, surgical equipment for cataract treatment has been introduced one after another, such as laser emulsifier and cold ultrasound emulsifier, which can solve some adverse effects of the equipment on the surgery, such as heat damage and IOP stability, etc. The ultrasound emulsification probe can finish the emulsification and extraction of cataract through a tiny incision of 1.5mm-2.8mm. -It has the advantages of no suture, no increase in astigmatism, good safety and fast recovery. The so-called “no damage” technology means that the ultrasonic emulsification needle only acts on the cloudy lens during the surgery, and has almost no adverse effect on the adjacent tissues such as cornea, iris and retina, etc. The surgery can be completed in 5-10 minutes. This greatly improves the safety of cataract surgery, and after surgery, the cornea is as bright as before, the pupil is responsive, and the original vision can be restored after 1-2 days. In the past, most people thought that cataract surgery could only be performed when the cataract had reached the level of blindness, commonly known as “long ripening”, but nowadays, surgery can be performed if the visual acuity is around 0.3. Medical research has proven that it generally takes 3-5 years from the onset of cataract to blindness, and it may take longer for individual patients. During the period when patients have cataract, they see things in a blurred and foggy state, and their work and life are greatly affected, while some people with glaucoma factor, the development of cataract may induce the acute attack of glaucoma and make the visual function suffer serious damage. Therefore, with the advancement of modern surgical technology, especially the application of ultrasound emulsification, the safety and success of the surgery are brought to the highest point. The surgery can be done immediately for vision below 0.3, avoiding the long and painful process from blurred vision to blindness, and also avoiding the possibility of cataract causing glaucoma. If the cataract waits until after the blindness is operated, it will be more difficult to operate due to the increased hardness of the nucleus of the lens, and even the advanced ultrasonic emulsification surgery cannot be done anymore, which is also a great regret for the patient. IV. Adaptation to modern life In the past, cataract patients’ requirements for post-operative vision were often limited to visual acuity. For example, the cataract intracapsular extraction done in the 1960s required bed rest for 1-2 weeks after surgery, and large thick glasses of 1000 degrees had to be worn to see; in the late 1980s, the cataract extracapsular extraction IOL implantation was introduced, so that objects could be seen after surgery without glasses, and the patient could move freely after surgery; in the 1990s, the introduction of ultrasound emulsification made the surgical incision reduced from 10mm to 3mm without sutures, which solved the trouble of astigmatism brought by the surgical incision and made the postoperative vision better; and the current method has the advantages of no anesthesia, short hospitalization or even no hospitalization, no restriction on activities, and no medication after surgery, in addition to obtaining good vision, which is favored by the elderly. V. Perfection of visual quality Under normal circumstances, the lens in our eyes plays the role of a convex lens of about 18D, and it can also be adjusted to see both far and near. When cataract occurs, these roles are obviously weakened or even disappeared. Therefore, doctors need to implant an IOL to replace the function of the original lens while doing cataract removal. Theoretically, the IOL should have the function of our natural lens. Nowadays, the IOLs on the market are far from meeting this requirement, mainly with a single lens function. Patients choose to see either mainly at a distance or mainly near, which cannot meet people’s idealized demand for vision. In recent years, the introduction of several new types of IOLs has brought gospel to cataract patients, such as adjustable IOLs and multifocal IOLs can make the postoperative eyes have the dual functions of seeing far and near, and can see clearly both far and near; astigmatic IOLs can correct the nearsightedness and farsightedness of the eyes, but also the original astigmatism of the cornea, which can be said to be a multi-benefit; aspheric IOLs can correct the phase difference of our eyes and make the postoperative clearer vision; blue light blocking IOLs play a better filtering role against external harmful light and protect our retina. In conclusion, the development of cataract surgery today, the improvement of technology, the upgrade of equipment, and the delicate operation of doctors have made this surgery reach a near-perfect situation, providing a safe and reliable medical guarantee for many blind people with cataracts to regain their sight.