NEARSIGHTED? NEED READING GLASSES? New developments in lens technology ensure a solution to almost discountcontacts every vision problem. Talk to your eye doctor discountcontacts about what''s available (costs vary).Rigid gas-permeables Recommended for those with high discountcontacts degrees of corneal astigmatism, RGPs are firm plastic lenses with microscopic slits that allow more oxygen to reach the eye. RGPs have a greater resistance discountcontacts to bacteria because they don''t contain water. Improved extended-wear materials also guarantee greater durability, sharper vision, comfort and cheaper maintenance costs. Allow yourself a week or two to get used to these slightly stiff lenses.Bifocals These contact correct presbyopia, a kind of farsightedness that discountcontacts usually occurs around age 40. There are two types:

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, a material must be transparent, without bubbles, and have a high index of refraction. The greater the index of refraction, the thinner the lens can be. Lenses are made from discountcontacts either glass or plastic discountcontacts (hard discountcontacts resin). The advantage of plastic is that it is lightweight and more impact resistant than glass. The discountcontacts advantage of glass is that it is scratch resistant and provides the clearest possible vision.