The principle of orthokeratology is to gently reshape the cornea by using hard and high-permeability contact lenses, so as to flatten the corneal center of myopia patients, reduce myopia and astigmatism, and improve naked eye vision. Wearing glasses during sleep for 8- 10 hours exerts slight pressure on the cornea, slowly changes the shape of the cornea, and flattens the central optical zone of the cornea, thus slowing down the growth of myopia, and the naked eye can see clearly during the day, which is called "taking off glasses during sleep".

Domestic brands are around 3000-6000; The prices of imported brands are generally high, ranging from 6,000 to more than 10,000. Commonly used imported brands include Euclid in the United States, Alpha in Japan, Dreamlite in the Netherlands, Lucid in South Korea, Shi Jing in the United States and other domestic brands like Dream David and Hengtai.