Which of the following is NOT a classification of contact lenses based on the replacement schedule?

The classification of contact lenses according to their replacement schedule typically includes daily wear, extended wear, and disposable lenses. Daily wear lenses are designed to be worn during the day and removed at night, while extended wear lenses can be worn continuously for several days or weeks. Disposable lenses refer to those that are intended for short-term use and are discarded after a specified period, which may range from one day to several days.

The term "permanent wear" is not a recognized classification within the context of contact lenses and their replacement schedules. This terminology does not reflect accepted practices and could be misleading. Contact lenses require regular replacement and care to maintain ocular health, and there is no lens type intended for permanent use without replacement at regular intervals.

Therefore, since "permanent wear" does not align with established replacement schedules for contact lenses, it is identified as the option that does not fit within the recognized classifications.