AskDefine | Define farsightedness

Dictionary Definition

farsightedness n : abnormal condition in which vision for distant objects is better than for near objects [syn: hyperopia, hypermetropia, hypermetropy, longsightedness] [ant: myopia]

User Contributed Dictionary

English

Noun

  1. The condition of being unable to focus on near objects.
  2. The quality of being considerate about what might happen in the future.

Synonyms

Antonyms

Translations

the condition of being unable to focus on near objects
  • German: Weitsichtigkeit
  • Hungarian: távollátás
the quality of being considerate about what might happen in the future
  • German: Weitsichtigkeit, Weitblick
  • Hungarian: előrelátás

Extensive Definition

Hyperopia, also known as hypermetropia or colloquially as farsightedness or longsightedness, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or when the lens cannot become round enough), causing inability to focus on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves toward the eye, the eye must increase its power to keep the image in focus on the retina. If the power of the cornea and lens is insufficient, as in hyperopia, the image will appear blurred.
Hyperopia is often confused with presbyopia , another condition that frequently causes blurry near vision. Presbyopes who report good far vision typically experience blurry near vision because of a reduced accommodative amplitude brought about by natural aging changes with the crystalline lens.

Classification of hyperopia

Hyperopia is typically classified according to clinical appearance, its severity, or how it relates to the eye's accommodative status.

Classification by clinical appearance

  • Simple hyperopia
  • Pathological hyperopia
  • Functional hyperopia

Diagnosis

Visual acuity is affected according to the amount of hyperopia, as well as the patient's age, visual demands, and accommodative ability.

Treatment

Various eye care professionals, including ophthalmologists, optometrists, orthoptists, and opticians, are involved in the treatment and management of hyperopia. At the conclusion of an eye examination, an eye doctor may provide the patient with an eyeglass prescription for corrective lenses.
Minor amounts of hyperopia are sometimes left uncorrected, however, larger amounts may be corrected with convex lenses in eyeglasses or contact lenses. Convex lenses have a positive dioptric value, which causes the light to focus closer than its normal range.
Hyperopia is sometimes correctable with various refractive surgery procedures.

Notes

farsightedness in Catalan: Hipermetropia
farsightedness in Czech: Dalekozrakost
farsightedness in Danish: Langsynethed
farsightedness in German: Weitsichtigkeit
farsightedness in Spanish: Hipermetropía
farsightedness in Esperanto: Hipermetropio
farsightedness in Basque: Hipermetropia
farsightedness in French: Hypermétropie
farsightedness in Italian: Ipermetropia
farsightedness in Hebrew: רוחק ראייה
farsightedness in Lithuanian: Toliaregystė
farsightedness in Dutch: Verziendheid
farsightedness in Japanese: 遠視
farsightedness in Norwegian: Hypermetropi
farsightedness in Polish: Nadwzroczność
farsightedness in Portuguese: Hipermetropia
farsightedness in Russian: Дальнозоркость
farsightedness in Slovak: Ďalekozrakosť
farsightedness in Slovenian: Daljnovidnost
farsightedness in Swedish: Översynthet
farsightedness in Vietnamese: Viễn thị
farsightedness in Turkish: Hipermetropi (göz kusuru)
farsightedness in Chinese: 遠視
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