Asthenopia

Asthenopia

DiseaseDisorder infobox
Name = Asthenopia
ICD10 = H53.1
ICD9 = ICD9|368.13

Asthenopia (aesthenopia) or eye strain is an ophthalmological condition that manifests itself through nonspecific symptoms such as fatigue, red eyes, eye strain, pain in or around the eyes, blurred vision, headache and occasional double vision. Symptoms often occur after reading, computer work, or other activities that involve tedious visual tasks.

When concentrating on a visually intense task, such as continuously focusing on a book or computer monitor, the inner eye muscles may tighten, which can cause the eyes to get irritated, dry, and uncomfortable. Giving the eyes a chance to focus on a distant object at least once an hour usually alleviates the problem. Small font sizes exacerbate the strain if they cause unconscious squinting or straining to focus.Fact|date=October 2007

On a computer, a CRT with a low refresh rate (less than 70 Hz) can cause similar problems because of the flickering image. Aging CRTs also often go slightly out of focus, and this can also cause eye strain. LCDs do not go out of focus and are less susceptable to visible flicker. Higher refresh rates and larger font sizes are worthwhile when addressing eyestrain problems.Fact|date=October 2007

Causes

Sometimes, asthenopia (aesthenopia) can be due to specific visual problems, such as uncorrected refraction errors or binocular vision problems like accommodative insufficiency or heterophoria.

See also

*Computer vision syndrome
*Eye examination
*Vision therapy
*Astigmatism

External links

* [http://www.eyesite.ca/english/public-information/eye-facts/reducing.htm Reducing Eye Strain]


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Look at other dictionaries:

  • Asthenopia — As the*no pi*a, n. [Gr. a priv. + sqe nos strength + w ps eye.] Weakness of sight. Quain. {As the*nop ic}, a. [1913 Webster] …   The Collaborative International Dictionary of English

  • asthenopia — [as΄thə nō′pē ə] n. [ModL < Gr asthenēs, weak (see ASTHENIA) + OPIA] a strained condition of the eyes, often with headache, dizziness, etc. asthenopic [as΄thənäp′ik] adj …   English World dictionary

  • asthenopia — asthenopic /as theuh nop ik/, adj. /as theuh noh pee euh/, n. Ophthalm. a fatigue or tiring of the eyes, usually characterized by discomfort, dimness of vision, and headache, caused by overuse of the visual organs, dysfunction of the ocular… …   Universalium

  • asthenopia — noun An ophthalmological condition that manifests itself through nonspecific symptoms such as fatigue, red eyes, eye strain, pain in or around the eyes, blurred vision, headache and occasional double vision. Syn: eyestrain …   Wiktionary

  • asthenopia — Subjective symptoms of ocular fatigue, discomfort, lacrimation, and headaches arising from use of the eyes. SYN: eyestrain. [G. astheneia, weakness, + ops, eye] accommodative a. a. due to errors of refraction and excessive contraction of the… …   Medical dictionary

  • asthenopia — n. eye fatigue …   English contemporary dictionary

  • asthenopia — as·the·no·pia …   English syllables

  • asthenopia — n.; see eyestrain …   The new mediacal dictionary

  • asthenopia —   n. optical weakness, especially muscular.    ♦ asthenopic, a …   Dictionary of difficult words

  • asthenopia — noun a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem • Syn: ↑eyestrain • Hypernyms: ↑fatigue, ↑weariness, ↑tiredness * * * asthenopic /as theuh nop ik/, adj …   Useful english dictionary

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