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 Canadian study found that for one additional hour of time spent outside per week, the risk that a child would develop nearsightedness dropped by about 14 percent (Oosthoek, 2016).
Nearsightedness, or myopia, is a common vision condition in which close objects are seen clearly, but objects farther away are blurred.
The researchers also found that people who spent more years in school proved to be more myopic, with nearsightedness worsening for each year of school.
Waring III, MD, FACS, FRCOphth, spoke on the use of intracorneal ring segments for the correction of nearsightedness.
What's more, studies have shown that a number of patients who undergo RK surgery to treat their nearsightedness may become farsighted and need corrective lenses for close vision because of a hyperopic shift--a gradual but continuing shift toward farsightedness.
It approves AZT for the purpose of treating patients with HIV, or excimer lasers for the purpose of performing certain procedures to correct nearsightedness.
In addition, the study found connections between nearsightedness, IQ and the level of education achieved by each young man.
apl received the lens procedure to correct his nearsightedness in July 2012 and is seeing better than he ever has in his life.
Summary: TEHRAN (FNA)- People have long taken for granted that glasses and contact lenses improve vision for nearsightedness, but the genetic factors behind the common condition have remained blurry.
With some tweaking, could nearsightedness and astigmatism be treated as well?
Vision problems such as nearsightedness are genetic traits that can skip a generation.
The Bausch & Lomb PureVision(TM) soft contact lens, now available in the United States, is designed to correct spherical aberration, a condition that researchers estimate effects nearly 70-percent of the population(1), in addition to correcting for nearsightedness and farsightedness.