How Contact Lenses Work

Contact lenses are thin transparent plastic discs that sit on the cornea. Just like eyeglasses, they correct refractive errors such as myopia (nearsightedness) and hyperopia (farsightedness). Contact lenses are shaped based on the vision problem to help the eye focus light directly on the retina.

On the surface of your eye there is a layer of tear fluid, this fluid is what keeps the contact lenses in place. Eyelid pressure also holds them in place. As the eye blinks, it provides lubrication to the cornea and helps flush away any impurities that may have become stuck to the lens.

Contact lenses are closer to natural sight than eyeglasses. To allow a more natural field of vision, contact lenses move with your eye and correct the error closer to the eye. They will not obstruct your line of sight, like glasses can. Contact lenses can be worn all day, or even several weeks at a time, depending on the type of lenses your doctor prescribes.

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