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ADVANTAGES AND DISADVANTAGES OF CONTACT LENS
Among new lens wearers, soft contacts are favored two to one over hard contact lenses. Still, hard contacts do provide superior visual correction and are the only type corneal surface. They are less expensive, more durable, require minimal care – daily removal and simple cleaning -may be polished to remove scratches, and reground to adjust to small changes in the eyes. But hard contacts require a protracted break-in period. They are difficult to get used to and must gradually be worn for hours at first and then only up to eighteen hours at a time. If you stop wearing them for a few days, you must repeat the gradual breaking-in process. Rushing the adjustment can lead to painful eye inflammations.
Hard contact lenses let you change the color of your eyes. They can be tinted purple for cosmetic uniqueness, made into bifocals, and do correct a wide range of deficiencies. They may be adapted in any number of other ways limited only by one’s imagination.
Made of a special hard plastic, as well, the gas-permeable contact lens is more expensive than the standard polymethyl methacrylate hard contact. It lets through oxygen and carbon dioxide, enabling the cornea to “breathe.” The gas-permeable lens seems more comfortable to most people. They adapt to it faster than the regular hard lens. If you need the visual correction offered by a hard lens but cannot tolerate the conventional type, the gas-permeable one is probably preferable.
The American Association of Ophthalmology warns that there are certain conditions which make the wearing of contact lenses inadvisable. Examples are chronic inflammation, infection, or allergy affecting the eyes. Some persons suffer from chronic dryness of the eyes due to a deficiency of tears; this may make it impossible for them to tolerate contact lenses. A person who cannot manipulate small objects with ease because of arthritis or tumor affecting the hands is also not a proper candidate for contact lenses. There may be some transient discomfort during the initial period of adjusting oneself to contacts. You may experience discomfort if a bit of foreign matter gets into your eye and lodges behind the lens.
At the beginning of this subsection on contacts we suggested that loss of a contact lens could stop traffic. In fact, if your lens should become dislodged or lost while you are driving, a serious hazard would result. Persons who wear contacts and do a lot of driving are advised to carry a spare set of lenses.
If you have an illness which might cause you to lose consciousness at times, as with diabetes or epilepsy, you should wear a medical information bracelet which, along with other vital information, records the fact that you are wearing contact lenses. In an emergency, the person providing medical care would be alerted to remove the lenses. Hard contacts should never be worn during sleep. The natural blink reflex keeps fluid circulating under the lens; this is necessary to the metabolism of the cornea. Normal fluid circulation ceases when the patient sleeps with his contact lenses in place.
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