View source for Hemianopsia

A homonymous hemianopsia is the loss of half of the field of view on the same side in both eyes. It is also referred to as a homonymous hemianopia.  It occurs frequently in stroke and traumatic brain injuries due to the way part of the optic nerve fibers from each eye crossover as they pass to the back of the brain. The visual images that we see to the right side travel from both eyes to the left side of the brain, while the visual images we see to the left side in each eye travel to the right side of the brain. Therefore, damage to the right side of the posterior portion of the brain can cause a loss of the left field of view in both eyes. Likewise, damage to the left posterior brain can cause a loss of the right field of vision. The most common causes of this  damage include stroke, brain tumor and trauma.
When the pathology involves both eyes, the following specific terms are used:


* Heteronymous hemianopsia - A loss of different visual field halves.
** [[Binasal hemianopsia]] - The loss of the fields surrounding the nose
** [[Bitemporal hemianopsia]] - The loss of the fields closest to the temples
* [[Homonymous hemianopsia]] - A loss of the same visual field halves.

==Etymology==
Hemi - half

an - without

opsia - seeing

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[[Category:Blindness]]

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== External links ==
* [http://www.hemianopsia.net Hemianopsia.net]
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