1, the way to wear it. Both belong to contact lenses, but contact lenses are soft lenses, which are worn during the day and taken at night; Orthokeratology is a hard lens, which is worn at night and taken in the morning. Wearing contact lenses during the day is easily affected by the environment and sandstorm, causing eye problems such as dry eyes.

2. Function. Contact lenses can only make you see things or beautiful scenery clearly, but they can't control the growth of myopia; Orthokeratology glasses only need to be worn at night, and the daytime vision can be improved by about 1.0, which can correct myopia and effectively prevent the growth of myopia.

3. Oxygen permeability value. The maximum oxygen permeability of ordinary contact lenses is less than 50, which affects the breathing of eyes and the circulation of tears and cannot be worn for a long time; However, the oxygen permeability of orthokeratology lens can reach 120, which is high in oxygen permeability, less harmful to cornea and has shaping effect.

4. Safety to cornea. Contact lenses are directly attached to the cornea when worn, which is easy to rub the cornea and hinder the alternation of tears; When wearing orthokeratology lens, it is necessary to drip lubricating liquid into the lens. There is a layer of liquid between the eyes and the lens, which will not directly wear the cornea and maintain safety.

5. Age limit. Contact lenses are not suitable for children under 18 years old, because their poor air permeability affects the eye development of underage children. Orthokeratology has a wide range of applications, and it is best for teenagers and adults aged 6-40 to wear it.

6. service life. Generally, the service life of contact lenses is divided into daily throwing, monthly throwing and semi-annual throwing, and the longest one will not exceed one year, and the replacement cycle is short; Orthokeratology lenses have a long service life and are usually replaced once every two years, saving a lot of money.

People's Network-Orthokeratology Mirror