AskDefine | Define hyperopia

Dictionary Definition

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

User Contributed Dictionary

English

Noun

hyperopia
  1. A disorder of the vision where the eye focusses images behind the retina instead of on it, so that distant objects can be seen better than near objects.

Derived terms

Translations

disorder of the vision

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

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