Wearing lenses for a long time every day will lead to hypoxia in corneal tissue, and it is easy to reduce the wearing comfort due to lens precipitation or lens dehydration. More than 80% wearers will have symptoms such as jealousy, visual fatigue and dry eyes after wearing 13 hours continuously, and some wearers have to take off their lenses and temporarily stop wearing them. Therefore, it is recommended to wear glasses for no more than 8 hours a day, and no more than 12 hours at most. For high myopia (above 600 degrees), it is recommended to wear glasses for no more than 8 hours every day due to the increase of lens thickness.

Generally speaking, the appropriate wearing time is the first day (four hours), the second day (six hours), the third day (eight hours) and the fourth day (ten hours). If you are used to it, you can adjust your own time, but it is recommended not to wear it for too long every day and not to sleep with ordinary lenses.