I. What is ICL IOL implantation? ICL IOL implantation, also known as posterior chamber IOL implantation in crystalline eyes, is currently considered to be one of the newest technologies that can replace LASIK, PRK and other cutting procedures for refractive correction. It can be used to correct a wide range of myopia, hyperopia and astigmatism without removing or destroying corneal tissue, without post-surgical sutures, especially for high myopia treatment is particularly effective. ICL is suitable for people aged 18-50, with stable refractive error, no history of internal eye surgery and intraocular uveal, retinal and glaucoma pathologies, and good corrected visual acuity. 2. The corrected range of farsightedness is 300–1000 degrees, the corrected range of myopia is 300–2300 degrees, the range of astigmatism is 100–400 degrees; 3. High myopia cannot accept glasses, corneal contact lenses (RGP), have good corrected visual acuity, no high intraocular pressure and glaucoma, no history of uveitis, and understand the possible results of surgery. 4, for limited corneal thickness, excimer laser is difficult to take into account the preservation of safe corneal thickness and a large enough cutting area; ICL is a good choice. Third, ICL is not suitable for people 1, systemic or eye disease is not suitable for internal eye surgery. 2, age > 55 years old. 3.Central anterior chamber depth <2.8mm. 4.Ocular segment disease: lens disease (early cataract, lens hemianopsia), corneal endothelial count <2 000/mm2 or corneal degeneration, glaucoma. 5. With uveitis (active or resting phase). 6, accompanied by diseases that require regular peripheral fundus examination, ICL implantation will have some effect on peripheral retinal examination. 7. The patient cannot understand the risk of surgery and is overly anxious. Steps: 1. First, a small incision will be made in the area between the white and black of your eye. 2. Then, a gel is injected into your eye to protect the intraocular tissues, and then the ICL is pushed into the eye. 3. Afterwards, the ICL is carefully adjusted to the back of the iris and the gel is flushed out of the eye. V. Frequently Asked Questions: 1. Am I a candidate for this procedure? If you have only myopia or myopia + astigmatism, are 18 years old - 45 years old, and have no other eye diseases, you are perfectly eligible for ICL implantation. ICL surgery can correct most refractive errors, including many conditions that are not suitable for corneal laser surgery. It is especially advantageous in the correction of high myopia, for example, patients with myopia higher than 8.00D, thin corneas, large pupils, etc. who cannot perform laser surgery. 2.What are the advantages of ICL surgery? The surgery was first carried out in 1997, and more than 80,000 cases have been implanted since then; in China, it was carried out in 2003, and more than 3,000 cases have been implanted. Highly predictable, through the preoperative precision examination, the surgery can achieve the expected visual quality after completion; recoverable, if there is any problem, regardless of the time duration can be removed at any time; high biocompatibility, unique biomaterials to ensure good biocompatibility, can be placed for a long time. You can neither see nor feel the crystal. The only feeling is that you can see a clear world. 3.Does it affect my appearance when I have the surgery? There is absolutely no need to worry. The lens is not visible to the naked eye of the examiner. Only with special examination equipment can the lens be examined. 4.Will my vision recur after the surgery? If there is a significant change in vision during the annual follow-up after the surgery, you can wear frames, contact lenses, etc. or consider re-surgery for a new ICL lens, but of course only a few such cases have been found so far out of 80,000 implantations worldwide.