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Another type of multifocal, a trifocal, has an area in-between that corrects for intermediate distances (usually about 28 in). Conventional bifocals and trifocals have visible lines between the areas of 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, contact a material must be transparent, without bubbles, and have a high index of refraction. The greater lenses the index of refraction, the thinner speciel and effects the lens can be. Lenses are made from either glass contact or plastic (hard resin). The advantage of plastic is that lenses it is lightweight and more impact resistant speciel than glass. The advantage of glass is that it is scratch resistant and provides the clearest possible vision.

Another type of multifocal, a trifocal, has an area in-between that corrects for intermediate distances (usually about 28 in). Conventional bifocals and trifocals have visible lines between the areas of 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, contact a material must be transparent, without bubbles, and have a high index of refraction. The greater lenses the index of refraction, the thinner speciel and effects the lens can be. Lenses are made from either glass contact or plastic (hard resin). The advantage of plastic is that lenses it is lightweight and more impact resistant speciel than glass. The advantage of glass is that it is scratch resistant and provides the clearest possible vision.

Tint, however, does not block-out UV rays, effects so a UV coating is needed. Polaroid lenses that block out much of the reflected light also allow better vision in sunny weather and are helpful for people who enjoy boating. contact Photosensitive (photochromatic) lenses that darken in the presence of bright light are lenses handy for people speciel who don''t want to carry an extra set of glasses. Photochromatic lenses are available in glass and plastic.Frames Frames effects can be made from contact metal or plastic, and they can be rimless. There is an almost unlimited variety of shapes, colors, and sizes. The type and degree of refractive correction in the lens determine to some extent the type lenses of frame most suitable. Some lenses are too speciel thick to fit in metal rims, and some large-correction prescriptions are best suited to frames with small-area lenses.

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