lensesesOver 140 million people in the United States durasoft wear lenseses. People whose eyes have refractive errors do not see clearly colors and contact without glasses, because the light emitted from the objects they are observing does not come into lenses focus on their retinas. For people durasoft who are farsighted, images come colors into focus behind the contact retina; for people who are nearsighted, lenses images come into focus durasoft in front of the retina. colors Lenses work by changing the direction of light so that images come into focus on the retina. The greater the index of refraction of the lens material and the greater the difference in the curvature between the two surfaces of the lens, the greater the change in direction of light that passes through it, contact and the greater the correction.Lenses lenses can be unifocal, with one correction for all distances, durasoft or they colors can be correct for more than one distance (multifocal). One type of multifocal, the bifocal, has an area of the lens (usually at the bottom) that corrects for contact nearby lenses objects (about 14 in from the eyes); the remainder of durasoft the lens corrects for distant colors objects (about 20 ft contact from the eyes).

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