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Before buying contact lenses make sure to consult the doctor and get the prescription. Contact lenses are medical devices supported by the lids, cornea, conjunctiva, and tear film. Contact lenses act as a physical barrier to normal tear-cornea-lid mechanics and corneal metabolism. This barrier effect can lead to various adverse reactions primarily related to oxygen deprivation. It is vastly important to understand normal anatomical and metabolic relations and how they are affected by the introduction of a contact lens to the eye. With contact lenses, both the myope and hyperope require the same accommodative effort at the eye. However, when wearing spectacles the effort is reduced for the myope but increased for the hyperope. Thus myopes need more accommodation for Columbus Contact Lenses wear than for spectacle wear, hyperopes need less. If the form and thickness of the lenses is taken into account by precise calculation, the results are found to be very similar for negative powers, with the discrepancy between ocular and spectacle accommodation increasing in the case of positive powers. The results above have assumed that the lenses are thin and this may be considered to be a close approximation. The difference in accommodative effort has important clinical implications for spectacle- wearing patients of presbyopic or prepresbyopic ages that are to be fitted with contact lenses. The spectacle- wearing myope who is a prepresbyope may find that with contact lenses, reading addition is needed that was not necessary while wearing spectacles. On the other hand, the spectacle-wearing hyperope who is an early presbyope may find it unnecessary to wear bifocals or reading glasses (at least not for another year or so) while wearing contact lenses. As a result of the differences in accommodation required with contact lenses as opposed to glasses, it follows that when a patient switches from glasses to contact lenses there will also be a change in the amount of accommodative convergence required. One could get contact lenses from their optician or vision care center which handles contact lenses. However first it is important to get prescription from the doctors. columbus contact lenses prescriptions are more complex for those eyeglasses because contacts require measurements for power, curvature, diam¬eter, and thickness, as well as a selection of design and material. For that reason it is best to get the prescription from an eye doctor. A contact lens prescription is determined after an initial evaluation and a follow-up visit or two. Before buying contact lenses take a couple of precautions. Don't continue buying the same lenses based on an old pre¬scription. Get an eye exam every year so that the doctor can check the eyes and see if they have changed. Contact lens com¬plications, if caught early, are usually reversible. Don't let the seller talk into buying a different kind of lens as an approved substitute for the one the doctor recommend¬ed. Check with the doctor first. Reading the reviews provided by the author is one of the best ways to gain necessary information on Optometrist Columbus
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