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contact lens spectrum - soft perm contactsBrowse our online catalog for the best prices on brand name colored contacts. Enhance your natural eye color, or change it! We offer prescription and non-prescription tinted contact lenses in all popular colors!
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NEARSIGHTED? NEED READING GLASSES? New developments in lens technology ensure a solution to almost every vision problem. Talk to your eye doctor about what''s available (costs vary).Rigid gas-permeables Recommended for those with high 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 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 lens spectrum correct presbyopia, a kind of farsightedness that usually occurs around age 40. there contact are lens two types: another type of multifocal, a trifocal, has an area in-between that corrects spectrum 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 contact 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 lens the index of refraction, the thinner 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. plastic frames are durable, can accommodate just about any lens prescription, and are available in a wide range of prices. they are also offered in a variety of plastics (including acrylic, epoxy, cellulose acetate, cellulose propionate, polyamide, and nylon) and in different colors, shapes, and levels of resistance to breakage. epoxy frames are resilient and return to spectrum their original shape after being deformed, so they do not need to be adjusted as frequently as other types. nylon frames are almost unbreakable. they revert to their original shape after extreme trauma and distortion; because of this property, though, they cannot be readjusted after they are manufactured.fit the patient should have the distance between the eyes (pd) measured, so that the contact optical centers of lens the lenses will spectrum be in front of the patient''s pupils. bifocal heights also have to be measured with the chosen frame in place and contact adjusted on the patient. again, this is so the lenses will be positioned correctly. if not positioned correctly, the patient may experience eyestrain or other problems. this can occur with over-the-counter reading glasses.
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