Some myopic patients are unable to undergo classical excimer laser surgery due to high corneal curvature and thin corneas. ICL, or Implantable Contact Lans (ICL), also known as “phakic IOL” ICL, is known as a “boon to patients with high myopia”. ICL, also known as “phakic IOL”, is known as “a boon to patients with high myopia”. It is a soft artificial lens, another innovative technological achievement in the field of modern refractive ophthalmology, which can be placed in front of the clear lens of the human eye and is only about 50 microns thick, thinner than the diameter of a hair. ICL lenses include: anterior chamber, posterior chamber, and iris-holding fixed types. The technology of intraocular lens implantation for myopia began in the 1990s and was first applied in the United States and gradually spread. At that time, “anterior chamber fixed lens” was the main implantation procedure, but the atrial angle fixed type was prone to complication of atrial angle blockage glaucoma, so the scope of this technique was limited. At this time, the iris-holding intraocular lens came into being, and its effect in treating myopia was confirmed. However, this type of lens was fixed by clamping the iris with a clip on the lens, and the pupil kept moving and contracting every day, so the IOL was prone to slip out and the surgery failed. At the beginning of this century, “posterior chamber IOL” implantation for crystalline eyes began to be used for myopia treatment, gradually replacing “anterior chamber angle fixation” and “iris-holding” IOLs. IOLs have become the mainstream surgical procedure. Posterior chamber IOL (ICL) implantation is considered to be one of the newest technologies that can replace LASIK, LASEK and other excimer laser surgeries for myopia treatment. It not only covers the treatment range of all excimer laser surgeries, but also corrects ultra-high myopia, farsightedness and astigmatism that excimer laser cannot help. Currently, many people with high myopia, especially super high (≥1000 degrees) myopia, cannot undergo excimer laser surgery because of insufficient or relatively thin corneal thickness. The posterior chamber ICL brings hope to these patients: 1. The posterior chamber IOL (ICL) implantation procedure is very simple, requiring only a small incision of about 3 mm at the corneal limbus of the eye, then injecting a viscoelastic into the eye to prop up the anterior chamber, and inserting a specially made, extremely thin, folded IOL into the eye with a microinjector. The special, very thin, folded IOL is pushed into the eye (between the pupil and the clear lens) with a microinjector, then positioned in the ciliary sulcus, and the viscoelastic is flushed out, and the incision can be closed and healed on its own without sutures. The surgery time for a single eye is about 5-10 minutes, which is the same as the time for a double eye excimer laser surgery. 2. The treatment range of the latest posterior chamber IOL (ICL) implantation surgery: 400-2500 degrees of myopia, 200-1000 degrees of hyperopia, 100-600 degrees of astigmatism, age 20 years or older, stable refractive status in the past two years, insufficient or relatively thin corneal thickness, not suitable for excimer laser surgery, and the anterior chamber depth after examination is Patients with an anterior chamber depth of 2.8 mm or more can undergo ICL surgery to correct myopia. 3. Posterior chamber IOL (ICL) implantation surgery for myopia has the advantages of good predictability, postoperative visual stability, rapid recovery of vision, and wide range of correction of refractive error, which is especially suitable for patients with high and super high myopia. The blogger observed some of the patients with super high myopia who underwent ICL surgery, about 2000 degrees, and the best corrected visual acuity with glasses before surgery was only about 0.2-0.3, while the visual acuity after ICL implantation could even reach 0.8-1.0. In addition, because posterior chamber ICL implantation does not need to thin corneal thickness or destroy corneal tissue, no surgical sutures are required, and the surgery The safety of the procedure is higher. It is also worth mentioning that posterior chamber ICL implantation is reversible, so if the patient’s refractive status changes and the implanted ICL is no longer suitable, or if early symptoms of complications such as glaucoma or cataract appear, it can be replaced or removed at any time, eliminating the worries of these patients.