RGP has the reputation of being a “breathing contact lens”. Its most prominent advantage is that it has a highly oxygen permeable structure, which is healthier and safer, and is less likely to cause hypoxia and dry eye, and does not cause changes in the endothelial cell count of the cornea. In addition, RGP is highly respected by ophthalmologists worldwide because of its unique advantages: 1) good molding, not easily deformed, and high quality of optical correction. Especially for some patients with high myopia and astigmatism, the correction effect is better. For irregular astigmatism of cornea caused by various reasons, such as: cone cornea, after keratoconus surgery, after trauma, etc., it is the only correction method that can effectively improve visual acuity. 2. It has good biocompatibility. Even long-term wear will not cause corneal hypertrophy and edema. It also has a certain maintenance effect on the health of the cornea. RGP lenses can be worn continuously without daily removal for cleaning and can be worn day and night. It is easy to care for and has a long lens life, as long as you pay attention to the correct use, you can generally have a life of 2-3 years, from this point of view, it is also very economical. 4, high definition, can control myopia, astigmatism deepening, especially youth myopia can be slowed down by it, early cone cornea and cone corneal tendency to have treatment and slowing effect. This is unmatched by traditional soft lenses. Its only disadvantage is that patients must have a process of adaptation, usually about 1-2 weeks, patients will have a foreign body feeling, vision fluctuations, and dryness, after this period, the feeling will get better.