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Lateral homonymous hemianopsia - Definition



Definition


Lateral homonymous hemianopsia is the loss of vision in the left or right fields of vision of both eyes, with the overall field of vision therefore being reduced by about half its size. This type of hemianopsia is caused by a lesion on the visual pathways located just in front of the brain, namely the nerve fibers that connect the retina to the cerebral cortex. This lesion can be due to cranial trauma or a tumor, for example, and is typically located in what is called the optic chiasm, the area where these nerve fibers interconnect.
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