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Eye Health Center

Quiz: Glasses and Contacts in Focus

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As many adults are farsighted as are nearsighted.

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As many adults are farsighted as are nearsighted.

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Explanation: Nearsightedness is about 10 times as common as farsightedness.

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Bifocals have been around since ...

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Bifocals have been around since ...

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Explanation: American Founding Father Ben Franklin -- who had presbyopia, an inability to focus close-up that usually happens as you age -- described his invention, which has lenses for both far and near vision, in a letter to a friend in 1784.

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Progressive lenses ...

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Progressive lenses ...

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Explanation: Also called multifocal lenses or no-line bifocals, these lenses allow people to see things clearly at different viewing distances. Most people don't need bifocals until after age 40.

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Custom reading glasses can help you see better than the ones you buy at the drugstore.

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Custom reading glasses can help you see better than the ones you buy at the drugstore.

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Explanation: Vision typically differs from one eye to the other, and prescription glasses can meet each eye's needs. Also, custom lenses are crafted to account for the specific distance between your eyes. Still, store-bought glasses are cheap enough that you can have several pairs, and they're not likely to hurt anything -- unless by using them, you are missing regular eye exams.

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Who is more likely to wear contact lenses?

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Who is more likely to wear contact lenses?

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Explanation: A recent study, published in Optometry and Vision Science, found that women are 40% more likely than men to wear contact lenses.

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You should clean your contact lens case, as well as your lenses, regularly.

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You should clean your contact lens case, as well as your lenses, regularly.

  • Your Answer: 
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Explanation: After each use, rinse the case with fresh contact lens solution and leave it open to dry. The case should also be replaced every two or three months, and right away if it is cracked or otherwise damaged.

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It might be OK to sleep in ...

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It might be OK to sleep in ...

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Explanation: Extended-wear contacts are designed to be worn for several days and nights, usually no longer than a week for many lenses, without cleaning and disinfection or replacement. However, many doctors often don't recommend sleeping in any type of contacts as it raises the risk of infection. Check with your eye-care specialist at the first sign of anything different -- pain, discharge, or a change in vision.

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You should rub your lenses even if you use a no-rub solution.

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You should rub your lenses even if you use a no-rub solution.

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Explanation: Eye care professionals advise rubbing the lenses with your fingers, then rinsing them with solution before soaking them, even when you are using a no-rub solution.

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Is it OK to use someone else's glasses?

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Is it OK to use someone else's glasses?

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Explanation: The glasses probably are a different prescription from yours. While this won't permanently harm your eyes, it can cause eyestrain and headaches.

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You should always get UV-protective coating on your lenses.

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You should always get UV-protective coating on your lenses.

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Explanation: Shatter-resistant polycarbonate lenses, commonly used in sports, usually come with full ultraviolet protection. So do high-index lenses, a type of lightweight lens that allows people with strong prescriptions to avoid having very thick lenses. But UV coating is a good idea for people ordering less expensive lenses made of a plastic called CR-39.

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Lenses that get darker in bright light work best ...

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Lenses that get darker in bright light work best ...

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Explanation: These lenses don't change from light to dark well in cars or airplanes, where windows block the light rays that trigger the tint to change.

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How can astigmatism be corrected?

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How can astigmatism be corrected?

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Explanation: In astigmatism, light is not focused evenly on the retina, at the back of the eye. Eyeglasses are the simplest correction, but special soft contact lenses or rigid ones can be used. LASIK or other surgery might also help some people with astigmatism.

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Rigid, gas-permeable contact lenses ...

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Rigid, gas-permeable contact lenses ...

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Explanation: These lenses -- hard lenses that allow oxygen to flow through to the eye -- also tend to be more durable, and may provide clearer vision, than soft lenses.

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Circle lenses are cosmetic contact lenses that ...

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Circle lenses are cosmetic contact lenses that ...

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Explanation: You should seriously weigh the benefits and risks of wearing contact lenses for a purely cosmetic purpose. If you are considering cosmetic contact lenses, it's a good idea to discuss with your eye doctor and have the periodic exams that are required for all contact lens wearers. Decorative lenses purchased at places like costume shops are illegal and could cause eye damage.

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Children too young to read an eye chart can't get glasses.

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Children too young to read an eye chart can't get glasses.

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Explanation: Eye care specialists can test vision using a tool that allows them to shine light in the eye and watch how it is reflected off the retina. If a problem is detected, different lenses are tested to see which one best corrects the problem.

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If your contact lens comes out and you don't have your usual supplies, you should ...

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If your contact lens comes out and you don't have your usual supplies, you should ...

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Explanation: Saliva and tap water are unsafe.

In general, if you wear soft contacts, carefully store the lens in saline or soaking solution as soon as possible until you can disinfect it. (If the lens is damaged or irritating, don't use it.) If you wear disposables, replace the lens with a new one. If you use gas permeable lenses, store the lens dry until you can care for it.

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