Are contact lenses really that harmful? _Contact lenses_

It seems that many people on the Internet are saying that contact lenses are harmful, and if they are worn for a long time, they seem to have a great impact on their eyes. There are also a large number of contact lenses in China, especially the sales of color lenses are so high, is it really a problem? In fact, the contact lenses have been inspected by the Food and Drug Administration and other departments, and there is no problem with the natural quality. But why do some people say that contact lenses are dangerous, is such a danger an alarmist? 1. Can contact lenses cause vision loss? The wearing of contact lenses requires a certain time limit. It is impossible to wear contact lenses 24 hours a day, and no longer than 8 hours a day. Otherwise, you may find a situation with decreased vision. Because your cornea cannot be exposed to air for a long time, there will be hypoxia, and it is normal for vision loss if metabolism cannot be carried out normally. It is recommended that you control the wearing time every day, at least the eyes must have a stretch process. Second, contact lenses can cause visual fatigue? This problem is well explained. The main cause of visual fatigue is that we overuse our eyes. Even if you wear framed glasses normally and face the computer and mobile phone 12 hours a day, you will experience visual fatigue. In fact, dry eye is really not just caused by contact lenses, but if you really wear contact lenses for too long every day, such problems may occur. It is recommended to choose contact lenses with high water content, which can also avoid many problems. Third, contact lenses can cause eye allergies? Human eyes are indeed allergic, but generally this is caused by serious protein precipitation or deterioration of contact lenses. Similar problems can occur if you wear expired contact lenses, or if you wear long-term contact lenses without proper care. Therefore, it is recommended that you pay attention to the time of wearing, and it is better to choose short-cycle contact lenses.