Health Library
The Health Library is a collection of health and wellness resources created for learning and accessibility. Select a topic below for related health information or search for a topic in the search bar for more information on other medical conditions.
Contact Lenses
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Contact lenses are small plastic or silicone discs shaped to correct refractive errors. After your doctor tests your vision, he or she will write a prescription for the lens you need. Your prescription may change over time. Contacts are placed directly on the eye, where they float on a film of tears in front of the...
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Several different types of contact lenses are available to treat vision problems. Consult an eye doctor who is willing to work with you to select the best type of lens for your needs and lifestyle. Hard contact lenses Most hard (rigid) lenses are made of gas-permeable materials that allow oxygen to reach...
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Bifocal contact lenses have been developed for people who have both nearsightedness and presbyopia. Bifocal lenses provide correction for both near and distance vision on each lens. A number of designs are available in hard and soft lenses. There are two main types of bifocal contact lenses: Segmented (also called...
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Contact lenses are small plastic or silicone discs shaped to correct refractive errors. After your doctor tests your vision, he or she will write a prescription for the lens you need. Your prescription may change over time. Contacts are placed directly on the eye, where they float on a film of tears in front of the...
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Not having enough tears (dry eye) is caused by a lack of one or more of the substances that make up tears. Dry eyes are common in those who wear contact lenses. Eye diseases, other diseases, and certain medicines can also cause dry eyes. Symptoms of...
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The following tips can help you keep your contacts clean and safe, which will help keep your eyes healthy and your vision as clear as possible. Carefully follow the cleaning instructions for your lenses. Keep your lenses and all supplies very clean....
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Several different types of contact lenses are available to treat vision problems. Consult an eye doctor who is willing to work with you to select the best type of lens for your needs and lifestyle. Hard contact lenses Most hard (rigid) lenses are made of gas-permeable materials that allow oxygen to reach...