2) divided by the duration of use.2.1 monthly (Monthly) must take clean every day.2.2 weekly (Weekly) must take clean every day.2.3 daily disposable Daily).These three categories, a general in the market, contact lens is about 8-4. Which usually must be removed. Do not put to sleep because it makes the cornea edema until the inflammation. However, a contact lens that can be put to sleep and not removed until the end of life. This contact lens must be paid by the doctor.
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