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Another type of multifocal, a trifocal, has an area in-between fun that corrects for intermediate distances (usually about 28 in). Conventional bifocals and trifocals have visible lines between the areas of contact different correction; however, lenses where the correction gradually changes from one area to the other, without visible lines, have been available since the 1970s. Such lenses are sometimes called progressives or no-line bifocals.To be suitable for lenses lenses, a material must be transparent, lenses without bubbles, and have a high index of refraction. The greater fun the index of refraction, the thinner contact the lens can be. Lenses are made from either glass or plastic (hard resin). The advantage of plastic is that it is lightweight and more impact resistant than glass. The advantage of glass is that it is scratch resistant and provides the clearest possible vision.

contact The concept of corrective lenses that sit directly on the eyeball was developed in the ninth century, but it was not until the late 20th century that manufacturing and grinding techniques for contact were perfected. Originally contact were made of glass, then later of hard plastic, lenses and still later of flexible, highly oxygen-permeable soft plastic. Today, the majority of lenses worn are of two fun basic types: rigid gas permeable (so-called "hard" lenses) and lenses. best lenses are smaller and more durable, but require a longer period of adjustment for the wearer. Hard contact can correct some vision problems, like astigmatism, that the lenses cannot. The lenses are slightly larger contact than best lenses. They are more comfortable and less expensive, but can be easily torn. The latest generations of contact are extended and disposable lenses. extended lenses lenses are intended to be worn for several fun weeks at a time, while disposable lenses are thrown away every day or every few weeks, or in the newest versions, every day.

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