More than 30 million Americans use contact lenses, according to the Contact Lens Council. In addition to offering flexibility, convenience, and a "no-glasses" appearance, "contacts" help correct a variety of vision disorders, including nearsightedness, farsightedness, astigmatism, and poor focusing with reading material.
But contact lenses also present potential risks. "Because they are worn directly on the eye, they can lead to conditions such as eye infections and corneal ulcers," says James Saviola, M.D. He is the Ophthalmic and Ear, Nose and Throat Devices Network Leader in the U.S. Food and Drug Administration (FDA) Center for Devices and Radiological Health (CDRH). "These conditions can develop very quickly and can be very serious. In rare cases, they can lead to blindness."
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Types of Contact Lenses
Soft Contact Lenses are comfortable and made of flexible plastics that allow oxygen to pass through to the cornea. Users get accustomed to wearing them within several days. Most soft-contact wearers are prescribed some type of frequent replacement schedule. An example of this is a schedule that calls for the lenses to be replaced with new ones after two weeks of use.
Rigid Gas Permeable (RGP) Lenses are durable, resist deposit buildup, and generally allow for clear, crisp vision. They last longer than soft contacts, and also are easier to handle and less likely to tear. However, they may take a few weeks of getting used to.
Extended Wear Contacts are good for overnight or continuous wear ranging from one to six nights, or up to 30 days. It's important for the eyes to have a rest without lenses for at least one night following each scheduled removal.
Disposable (Replacement Schedule) Contacts. To FDA, “disposable” means "to be used once and discarded." However, some soft contacts referred to as “disposable” by sellers are actually worn on a frequent replacement schedule--for two weeks, for example--that calls for them to be disinfected between uses.
Lenses Designed for "Ortho-K." Orthokeratology (Ortho-K) is a lens-fitting procedure that uses specially designed RGP contact lenses to change the curvature of the cornea to temporarily improve the eye's ability to focus. It's primarily used for the correction of nearsightedness. The most common type is overnight Ortho-K, and FDA requires that eye care professionals be trained and certified before using them in their practices.
Decorative (Plano) Contacts. FDA has often warned people about the risks associated with wearing these lenses without appropriate professional involvement. They don't correct vision and are intended solely to change the appearance of the eye.