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.

nearsightedness

[′nir¦sīd·əd·nəs]
(medicine)
References in periodicals archive ?
A new study present in the journal- Ophthalmology appearing offers further evidence that at least part of the worldwide increase in nearsightedness has to do with near work activities; not just screens but also traditional books.
Other evidence shows that Israeli teenagers who attended yeshivas, which involve intensive textual study, were much more likely to develop nearsightedness than other teenagers.
The Center offers LASIK (laser in-situ keratomileusis) surgery--a technique that precisely reshapes the cornea, treating nearsightedness, farsightedness, and astigmatism.
Syed Jamil Ahmed said that Myopia or nearsightedness occurs when light entering the eye focuses in front of the retina instead of directly on it.This is caused by a cornea that is steeper or an eye that is longer than a normal eye, he told adding that the opposite defect of myopia is farsightedness' or 'long-sightedness' this is where the cornea is too flat or the eye is too short.
Data shows that nearsightedness is a more common eye issue today among children and adolescents than it was just a few decades ago.
In addition to the cataract business, AMO has advanced laser vision technologies designed to enhance surgeon productivity and correct nearsightedness, farsightedness, and astigmatism.
Dubai: The Dubai Health Authority's (DHA) smart clinic has warned the public against the excessive use of smart devices that could lead to serious side effects including nearsightedness and dry eye.
Also called nearsightedness, myopia is a vision condition in which people can see clearly the objects that are close to eyes but objects far away appear to be blurred to the sight, Gulf news reported.
Index subject also had nearsightedness. However, symptoms in the craniofacial and axial skeleton were minimal.
All types of Lasik work by reshaping the part of the eye responsible for refraction to correct errors in vision such as Nearsightedness, Farsightedness, Astigmatism or Presbyopia (visual impairment associated with aging).
"There has been mention in the literature of stress being related to development of various eye conditions, but no research has been conducted on a possible relationship between childhood stress and the development of nearsightedness," Katz said.
The handheld device can screen patients from three feet away, scanning both eyes simultaneously, and detect everything from cataracts to nearsightedness. Early detection can be key to treating sight problems before they're irreversible, which in some conditions can happen at 5 years of age.