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(Lenses made ciba from polycarbonate, the same type of plastic used for the space shuttle windshield, are about 50 times stronger than other lens materials.) Also, people soft at risk of receiving standard electric shock should avoid ciba metal soft frames.People employed in certain occupations may standard be prohibited from wearing contact, ciba or may be required to wear safety soft eyewear standard over the contact. Some ciba occupations, such as construction or auto repair, may require safety lenses and safety frames. Physicians and employers should be consulted for recommendations. Description Eyes are examined by optometrists (O.D.) or soft by ophthalmologists (M.D. or D.O.--doctor of osteopathy). Prescriptions, standard and ciba if necessary, are then given to patients for glasses. The glasses are generally soft and standard made by an optician. A separate lenses-fitting exam is necessary ciba if the patient wants contact, because an lenses prescription is not the same as a lenses prescription.

They soft can be worn up to a week. Daily wear lenses are made of plastic that is permeable to oxygen and absorbs water; standard therefore, ciba they are soft and flexible. soft These lenses must be removed and cleaned each night, and they standard do not correct all vision problems. lenses are easier to get used to than rigid lenses, but are more prone to tears and do not last ciba as long. soft Extended-wear lenses are highly permeable standard to oxygen, are flexible ciba and soft by virtue standard of their ability to absorb water, and can usually be worn for up to one week. They do not correct all vision problems. There is more of a risk of infection with extended-wear lenses than with daily-wear lenses. Extended-wear disposable lenses are lenses worn continually for up to six days and then discarded, with no need for cleaning.