RGP is the abbreviation of Rigid Gas Permeable, the full name of the rigid gas permeable corneal contact lens. RGP has been widely used and carried out in foreign countries, and has been recognized by clinicians and praised by patients. It has a high fitting rate in regions where it is well developed: 55% in Japan, 40% in Europe and America, and 30% in Hong Kong and Taiwan. As early as 2002, RGP was designated by the Ministry of Health as one of the “100 promotion projects of the decade” (the only project in ophthalmology). It is the latest generation of contact lenses, made of a special material that has high oxygen permeability, wetness, hardness and elasticity, which ensures that the eye surface receives sufficient oxygen and reduces complications compared to ordinary soft lenses. It is the safest contact lens to wear today. It has good molding effect and good optical performance to ensure you get clear vision, even for high astigmatism and irregular astigmatism. ＊The clinician conducts a thorough examination of each patient and gives the most accurate and scientific correction according to the examination data tailored to the patient. RGP has a hard material, easy to use, convenient to care for, and has a much longer lifespan than ordinary soft lenses ＊ It has a certain control effect on the deepening of myopia in adolescents and can partially delay the development of myopia in adolescents ＊ RGP has a good correction effect on high astigmatism, especially corneal irregular astigmatism and astigmatism caused by trauma ＊ It has a good improvement effect on refractive parallax patients, especially on refractive parallax amblyopia. Indications for RGP: ＊Adolescents with rapidly developing myopia who wish to slow down the development of myopia. Refractive aberrations, refractive amblyopia, high astigmatism, especially irregular corneal astigmatism and astigmatism caused by trauma, long wearers (high DK) and long day wearers (medium to high DK), retro-regular astigmatism up to 1.50D and cis-regular astigmatism up to 2.50D, and aspheric design lenses for astigmatism over 2.50D. ＊High myopia, farsightedness and astigmatism can be fitted with +2000 degrees to -2000 degrees, with a wide range of adaptation ＊People who can no longer wear soft lenses due to stubborn lens deposits and inflammatory reactions can also choose RGP ＊Special cases, such as corneal irregularities (cone cornea, after corneal transplantation or corneal refractive surgery and after corneal trauma patients) and those without crystals. Especially for some patients with early or middle cone corneas, RGP can slow down their development Professional fitting of RGP: The fitting of RGP generally goes through more professional and complicated steps such as routine eye examination, corneal curvature or topography examination, fitting and trial wear evaluation, lens fitting and optometry; therefore, it is necessary to go to the ophthalmology department of a regular hospital or a professional optometry center for fitting and follow-up review at the same time. Contact lenses are one of the main ways to correct myopia, and in China, a large proportion of soft contact lenses are worn, but because of the low oxygen permeability of soft lenses, easy deformation, irregular fitting and use, many patients wearing soft lenses experience eye dryness, fatigue, foreign body sensation, blurred vision, and even eye infections in serious cases, resulting in irreversible vision loss. recognized by clinicians and well received by patients. It is the most accurate and safe method to give the most accurate and scientific correction through a comprehensive examination of each patient by a clinician, tailored according to the examination data. In the past, fewer and fewer people bought a pair of soft contact lenses according to their myopia, and it will become a trend to fit a pair of RGP with higher safety.