By wear time, there are two types,daily contact lens and extended wear lens.
Daily contact lens is designed to be removed prior to sleeping. An extended wear lens is designed for continuous overnight wear, typically for more than 6 hours wearing. Latest materials, such as silicone hydrogels, allow for even longer wear periods of up to 30 days wearing,that's market called monthly lens.
wearing extend wear lens, you have to clean the lens one times per day, better move out when you sleeping.
By frequency of replacement,there are daily disposable contact lens,which disposable over night.
Rigid gas permeable lenses are very durable and may last for several years without the need for replacement. PMMA hard lenses were very durable, and were commonly worn for 5 to 10 years.
contact lens solutions
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