IOL (Intraocular Lens) and ICL (Implantable Collamer Lens) are both types of lenses used to correct vision. IOLs are implanted inside the eye during cataract surgery to replace the cloudy natural lens, while ICLs are implanted in front of the natural lens to correct refractive errors such as myopia, hyperopia, and astigmatism. ICLs are typically used for younger patients who are not yet candidates for cataract surgery or who are not suitable for LASIK or other refractive surgeries.