• Hazards associated with poor-quality colored lenses
Regular color contact lenses have a "sandwich" structure, that is, a layer of tinted lenses is sandwiched between two layers of transparent lenses. However, there are also some inferior "color contact lenses" that are directly dyed on the surface of the lens, so wearing them for a long time may cause eye coloration.
Not only that, poor-quality "color contact lenses" can easily lead to conjunctivitis, dry eye syndrome, keratitis, etc., and even affect the range and clarity of night vision.
• Precautions for purchasing
When purchasing color contact lenses, you should purchase them from a medical device management company that has the relevant business license qualifications, and check whether the purchased product has obtained a medical device registration certificate, and carefully check whether the product packaging has a medical device registration certificate number, the name of the manufacturer, and the date of production, etc. information and keep the proof of purchase in a safe place.
In addition, we must pay attention to the oxygen permeability of the lens. The higher the oxygen permeability value, the stronger the ability to deliver oxygen to the eyes. When purchasing, you can refer to the recommendations of the International Association of Contact Lens Educators: the oxygen permeability of daily disposable lenses should be above 24 (DK/t); monthly or annual disposable lenses should be above 87 (DK/t).
• Prolonged wear is not recommended
Wearing contact lenses is equivalent to wearing a "mask" with poor air permeability on the cornea. Doctors suggest that ordinary contact lenses should be worn within 6-8 hours, and color contact lenses should be worn for about 2 hours. If worn for a long time, it may cause eye complications.
