Orthokeratology is defined clinically as the ability to see clearly without eyeglasses to a visual standard of 1.0 on a visual acuity chart 5 meters away. Myopia is usually more common in today’s society, with 50-300 degrees of myopia being low myopia, 300-600 degrees of myopia being moderate myopia, and over 600 degrees of myopia being high myopia. If myopia exists, especially in children, myopic glasses are usually recommended, and if children do not wear myopic glasses, myopia can easily deepen. Adults who do not wear myopia glasses, especially if they drive or have the need to see at a distance, will suffer from vision loss, which may even affect the safety of their daily lives. Therefore, if you have refractive errors that cause vision loss, it is recommended to go to the hospital for optometry and glasses.