What are the dangers of wearing contacts for a long time? 1, the eyes are vulnerable to damage by the pigment layer contacts contain pigment, most small brands of contacts pigment directly printed on the surface of the lens, if the production technology is not up to scratch, the use of pigment material may be shed, possibly leading to allergies, but also to the cornea, conjunctiva irritation, causing inflammation. 2, narrowing the field of vision Some contacts use a smaller optical area in pursuit of exaggerated color effects, which can narrow the field of vision of the eye when seeing things. The dyed part is generally less light-transmitting, so when you wear them, you feel that your field of vision has become smaller, and you have a sense of “peeking into the tube”, which is very bad for people who drive and play sports. 3, corneal hypoxia Some contacts have a low water content, the lens oxygen permeability is poor, long-term wear will lead to corneal hypoxia eye redness, eye discomfort, corneal neovascularization, etc. . 4, eye discomfort contacts have more precipitates, pigments and in the lens surface, can cause poor wetting of the lens, easy to cause dry eye disease, the main performance is visual fatigue, eye acidity, foreign body sensation, eye burning and even blurred vision. Therefore, it is advisable not to wear contact lenses as much as possible, and if you really need them, you should reduce the wearing time.