Heterophoria

Heterophoria

Infobox_Disease
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ICD10 = ICD10|H|50|5|h|49
ICD9 = ICD9|378.40
ICDO =
OMIM =
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Heterophoria is a type of eye condition where the motion of the eyes are not parallel to each other. This however,only occurs during dissociation of the left eye and right eye, whereby fusion of the eyes is absent. Heterophoria is usually asymptomatic. This is when it is compensated by fusional vergence. When fusional reserve is used to compensate for heterophoria, it is known as compensating vergence. In severe cases, when the heterophoria is not overcome by fusional vergence, sign and symptoms appear. This is called decompensated heterophoria.Heterophoria may lead to squint or also known as strabismus.

Etiology of HeterophoriaIn order to understand how heterophoria occurs,we must understand of how the eye can maintain proper fixation with non aligned visual axis. Heterophoria is actually the misalignment of the visual axis of both eyes. In other words, one eye or both eyes is not properly fixated to an object of interest. However, we must know that the eyes has a fusional vergence system which corrects this misalignment.

Menifestation of HeterotropiaWhen the fusional vergence system can no longer hold back heterophoria, the phoria becomes manifest. In this condition, the eyes deviates from the fixating position.

External links

* [http://www.mrcophth.com/eyeclipartchua/heterophoria.html Animation] at mrcophth.com
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* http://www.cochraneeyes.org/glossary.htm#H


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Look at other dictionaries:

  • heterophoria — A tendency for deviation of the eyes from parallelism, prevented by binocular vision. [hetero + G. phora, movement] * * * het·ero·pho·ria .het ə rō fōr ē ə, fȯr ē ə n latent strabismus in which one eye tends to deviate either medially or… …   Medical dictionary

  • heterophoria — n. a tendency to squint. Under normal circumstances both the eyes work together and look at the same point simultaneously, but if one eye is covered it will move out of alignment with the object the other eye is still viewing. When the cover is… …   The new mediacal dictionary

  • heterophoria — heterophoric /het euhr euh fawr ik, for /, adj. /het euhr euh fawr ee euh, fohr /, n. Ophthalm. a latent strabismus of one or both eyes. [1885 90; HETERO + Gk phoria a carrying, equiv. to phor(os) PHOROUS + ia IA] * * * …   Universalium

  • heterophoria — noun Latent strabismus, which occurs only during dissociation of the left eye and right eye, whereby fusion of the eyes is absent …   Wiktionary

  • heterophoria — n. tendency of one eye to deviate in one direction or another (Ophthalmology) …   English contemporary dictionary

  • heterophoria — het·er·o·pho·ria …   English syllables

  • heterophoria —   n. squint due to weak muscle.    ♦ heterophoric, a …   Dictionary of difficult words

  • heterophoria — …   Useful english dictionary

  • Гетерофория (Heterophoria) — тенденция к отклонению глазных яблок от параллельных осей. При нормальных обстоятельствах оба глаза работают вместе, одновременно смотря в одну и ту же точку, однако если прикрыть один глаз рукой, то он отойдет от первоначальной параллельной оси …   Медицинские термины

  • latent deviation — heterophoria …   Medical dictionary

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