ICL implantation, also known as posterior chamber IOL implantation in crystalline eyes, is currently the main way to correct myopia, especially high myopia. The procedure does not require the destruction of corneal tissue, and the implanted lens can be removed if problems are detected. ICL implantation has now become the preferred method for high myopia patients to get rid of their glasses. So, how does this procedure work? Here we reveal the details of the ICL implantation procedure. How many surgical incisions are there? How big are the incisions? The ICL implantation procedure is similar to cataract surgery in that there is a main incision and a side incision at the junction of the cornea and the sclera (black and white eyes). Because the incision is small, it does not change the curvature of the cornea, so it does not cause additional medically induced astigmatism. And, depending on the situation, the surgeon will choose a suitable location for the incision at the edge of the cornea, which can also correct part of the astigmatism, usually from 75 degrees to less than 100 degrees. For such patients with myopia with low astigmatism, there is no need for a custom-made toric IOL, which can be corrected by the design of the surgical incision location, and the postoperative results are excellent. Where is the IOL placed in the eye? The ICL is placed in the eye with a high water content and is very soft, so it can be placed and expanded through a small incision. The position of the lens is not affected. In addition, the ICL has a layer of fibronectin on its surface to inhibit inflammation and reduce the incidence of endophthalmitis, and the ICL itself is made of special materials that will not react or adhere to other tissues in the eye, and will not be rejected. After surgery, the implanted lens is not visible from the outside, and it is as if no surgery has been performed.