Contact lenses are usually worn for no more than 8 hours a day and daily wear is not recommended. The length of time that contact lenses can be worn varies depending on the type and performance of the contact lens, but regardless of whether they are regular contact lenses or corneal reshaping lenses, they should not be worn for more than 8 hours per day. Moreover, because contact lenses need to contact the cornea, they may prevent the exchange of oxygen between the cornea and the outside air. Wearing contact lenses for a long period of time may lead to corneal dehydration, oxygen deprivation and even possible damage, which may lead to infection. Therefore, it is recommended that contact lenses should not be worn for more than 8 hours a day, and should not be worn as often as possible, but 1-2 days a week. It is recommended that patients who experience eye discomfort after wearing contact lenses should consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for treatment.