nearsightedness

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nearsightedness

or

myopia,

defect of vision in which far objects appear blurred but near objects are seen clearly. Because the eyeball is too long or the refractive power of the eye's lens is too strong, the image is focused in front of the retina rather than upon it. Corrective eyeglasseseyeglasses
or spectacles,
instrument or device for aiding and correcting defective sight. Eyeglasses usually consist of a pair of lenses mounted in a frame to hold them in position before the eyes.
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 with concave lenseslens,
device for forming an image of an object by the refraction of light. In its simplest form it is a disk of transparent substance, commonly glass, with its two surfaces curved or with one surface plane and the other curved.
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 compensate for the refractive error and help to focus the image on the retina. Hard corneal contact lenses or soft hydrophilic contact lenses are another option, usually offering better acuity and peripheral vision than do eyeglasses. (Contact lenses may be troublesome for people who tend to get eye infections or have hand tremors, however.) Nearsightedness can also be corrected by using laser cornea surgery and a device called a microkeratome to flatten the eye, or by surgically implanting a corrective lens behind the iris.
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nearsightedness

[′nir¦sīd·əd·nəs]
(medicine)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"A nearsighted eye has a thinner and more delicate retina, which can more easily tear or become detached during or after surgery," says Dr.
I might be nearsighted again because I'm being stubborn, but they will never know how far my vision reaches because of reading a lot.
It's difficult for my assertive, practical-minded friends to understand, but being nearsighted has its comforts--and, I believe, may even shape personality Although I was always getting lost and had trouble recognizing people even a few feet away, I loved immersing myself in books and my own imagination.
The report also cited a study of 18 men kept indoors for 45 days who showed changes in eyesight toward myopia, mainly in men who were already nearsighted or farsighted.
For each extra hour spent outdoors per week, the likelihood of being nearsighted fell by around 2%.
Nearsighted children spent on average 3.7 fewer hours per week outdoors than those who either had normal vision or were farsighted.
He cited a Chinese study of 80 nearsighted children aged seven to 11.
Summary: People who are nearsighted may be nearly twice as likely to also develop glaucoma, a leading cause of blindness, according to a study.
If you're nearsighted and wearing distance-only glasses, you may have excellent near vision without your glasses and be more comfortable without glasses for reading than with progressives.
2) Even with eight eyes, spiders are notoriously nearsighted. 3) Spiders prey on insects, not people.
Within minutes, NETRA can diagnose whether someone is nearsighted or farsighted, or suffers from astigmatism or the vision loss associated with aging.
Debra Ronca, a contributor to the How Stuff Works website, says "Sitting close to the TV may not make a child nearsighted, but a child may sit close to the TV because he or she is nearsighted and undiagnosed."