Indications for ICL implantation 1. Age 18-50, stable refractive error in recent years, no history of internal eye surgery and history of ocular uveitis, retina and glaucoma, and good corrected visual acuity. 2.The correction range of myopia is 50–1900 degrees , astigmatism range is 100–600 degrees Beijing Union Hospital Ophthalmology Luo Yan 3.High myopia cannot accept glasses, corneal contact lenses (RGP), and request to remove glasses by themselves. 4, due to the limited corneal thickness, laser is difficult to retain a safe corneal thickness and a large enough cutting area, ICL is also a good choice. Patients must also meet the following criteria: Anterior chamber depth (ACD) equal to or greater than 2.8mm Stable refractive status (no refractive change greater than 0.5D in the year prior to implantation) Compliance with requirements for corneal endothelial cell density Ideal ICL candidates: All patients with -1.0D to -19.0D myopia (patients with -19D or greater may also choose ICL with partial retention of the degree not fully corrected) All patients who can undergo laser surgery to correct myopia Patients with large pupils Patients with thin corneas Patients with dry eyes Patients with irregular corneas or corneas with suspected lesions Patients with ocular diseases such as glaucoma, iritis, diabetic retinopathy, adhesive lesions, pigment spreading, pseudoexfoliation syndrome Patients with shallow and/or narrow anterior chamber angles Patients with Autoimmune system disease (e.g., lupus erythematosus, etc.) Patients who are pregnant or breastfeeding