lenses approved for continuous wear during the day and night are called Extended
wear lenses or Continual
lenses. These lenses intended for continuous wear are made from a silicone hydrogel material that
transmits more oxygen to the cornea of the eye, thereby
providing sufficient oxygen, even during sleep. With continual wear or extended
wear lenses, it is not necessary to remove and disinfect the lenses in Solution
during the wearing period.
It is always necessary to consult with an ophthalmologist before wearing lenses continuously to avoid health complications. Wearing lenses continuously also reduces the lifespan of lenses by up to 50%. For example, a bi-weekly lens can be worn for the full 14 days, if removed and disinfected daily. If the same bi-weekly lens is worn continuously for 7 days and 6 nights (e.g. Acuvue Oasys), it should be discarded after 7 days.