Color contact lenses, belonging to the "supervision and management of medical devices regulations" with a high risk, need to take special measures to strictly control the management to ensure its safety and effectiveness of the third class of medical devices.
Contact lenses are colorless and transparent, while contacts come with pigment inside, and the pigment of qualified products is added to the center, which is transparent inside and out. In fact, Class III medical devices are the highest level, referring to medical devices that are implanted in the human body for supporting and sustaining life, are potentially dangerous to the human body, and need to be strictly controlled for their safety and effectiveness.
Color flat contact lenses (pupils) are not cosmetics, but a medical device that requires strict supervision, as do artificial heart valves and artificial kidneys, and a medical device license must be obtained to operate such products. Qualified contacts are transparent inside and out, with pigment sandwiched between them, while some low-quality contacts will dye the pigment directly onto them and stain the cornea when worn in the eye.
When choosing contact lenses, you should pay more attention to the oxygen permeability of the lenses, the higher the value of oxygen permeability, the better the ability of the eyes to absorb oxygen.