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Hyperopia

{{{Name|Hyperopia}}}
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ICD-10 H52.0
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ICD-9 367.0
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Hyperopia, also known as hypermetropia or colloquially as farsightedness or longsightedness, is a defectof visioncaused by an imperfection in the eye(often when the eyeball is too short or when the lenscannot become round enough), causing inability to focuson near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves towards the eye, the eye must increase its power to keep the image on the retina. If the power of the cornea and lens is insufficient, as in hypermetropia, the image will appear blurred. Image:Hypermetropia.png

Inhaltsverzeichnis

  • 1 Prevalence
  • 2 Treatment
  • 3 Related conditions
  • 4 See also

Prevalence

An American study published in Archives of Ophthalmology found that nearly 1 in 8 (12.8%) children between the ages of 5 and 17 has hyperopia [1], and a recent Polish study found that 1 in 5 (21%) students between the age of 6 and 18 was hyperopic [2]. A recent Australian study found that nearly 4 in 10 (38.4%) children between the ages of 4 and 12 were hyperopic [3]. A recent Brazilian study, however, found that nearly 7 in 10 (71%) of the students in one city were hyperopic [4]. A study of Jordanian adults aged 17 to 40 found only 1 in 20 (5.7%) were hyperopic [5]. A recent study involving first-year undergraduate students in the United Kingdom found that 18.8% of British whites and 17.3% of British Asians were hyperopic[6].

Treatment

Minor amounts of hyperopia are sometimes left uncorrected, however, larger amounts may be corrected with convex lensesin eyeglassesor contact lenses. Hyperopia is sometimes correctable with various refractive surgeryprocedures.

Related conditions

  • Astigmatism
  • Myopia
  • Presbyopia

See also

  • Eye
  • Eyeglass prescription
  • Lens (optics)
  • Ophthalmology
  • Optician
  • Optometry
  • Refraction error
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Retrieved from "http://en.wikipedia.org/Hyperopia"



This article is licensed under the GNU Free Documentation License.
It uses material from the http://en.wikipedia.org/wiki/Hyperopia Wikipedia article Hyperopia.

 
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