Color plain contact lenses are not cosmetics, but medical devices that must be strictly supervised like artificial heart valves and artificial kidneys. Because cosmetic contact lenses directly cover the corneal surface and are in close contact with eye tissues, which is directly related to the safety of human eyes and has great risks, they are managed as the third kind of medical devices in China.
Precautions for purchase:
When purchasing cosmetic contact lenses, it should be purchased from a medical device business enterprise with relevant business license qualifications, and check whether the purchased products have obtained the medical device registration certificate, carefully check whether the product packaging has the medical device registration certificate number, the name of the manufacturer, the date of production and other information, and properly keep the purchase certificate.
In addition, we must pay attention to the oxygen permeability of the lens. The higher the oxygen permeability, the stronger the ability to deliver oxygen to the eyes. When purchasing, you can refer to the suggestion of the International Association of Contact Lens Educators: the daily oxygen permeability is above 24(DK/t); The monthly throw or annual throw is above 87(DK/t).