1, good physiological solubility, so that long-term wearing RGP lenses are not easy to cause corneal hypertrophy and edema. 2, high oxygen permeability, not easy to cause hypoxia and dry eye disease, will not cause changes in the number of corneal endothelial cells. 3, to prevent the deepening of myopia or astigmatism, vision correction effect is better than soft contact lenses. 4. Simple maintenance and long service life; with proper care, lenses can be used for up to 2-3 years. 5. Long-term use of lenses is inexpensive. 6, long-term use can maintain the physiological health of the cornea, high security. 7. For those who suffer from long-term oxygen deprivation, eye congestion or neovascularization, dry eyes, and poor vision correction due to soft contact lenses, they can switch to RGP lenses after their eyes recover their health. 8, according to domestic and international data: RGP lenses can effectively control the growth of youth myopia.