Bitemporal hemianopsia most commonly occurs as a result of tumors located at the mid-optic 4 I would like to thank Professor Mason and her. Bitemporal Heteronymous Hemianopia. 1. BITEMPORAL HETERONYMUS HEMIANOPIA Roll No. Muhammad Mubashir Tanvir Roll No. The Humphrey visual field test showed bitemporal visual field defects. The differential diagnosis of bitemporal hemianopia includes tumors causing.
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The visual information obtained from the temporal side falls on the medial nasal retina.
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The information of the optic nerve is transferred to the optic chiasm through the nasal retina. Bitemporal hemianopia is also known as bitemporal heteronymous hemianopia or bitemporal hemianopia.
The condition manifests when there is compression in the optic chiasm. Due to compression, the bktemporal that are generated from the nasal retina are affected and, as a result, both temporal and peripheral vision are affected.
It basically occurs when there is compression or destruction of the optic nerve. Hemmianopsia this condition, only the central vision remains active and this central field is sufficient to have a broad or clear vision. In a certain way, only with the central vision the person can perform, the bitemporal hemianopia does not alter the routine activities of life.
Hemianopia is the result of a lesion of the optic chiasm. This is the area where the optic nerves on the right side of the brain cross to the left and hemianopaia versa. The nasal retina transmits visual information of the temporal visual field and the temporal retina transmits information of the nasal field. In the optic chiasm, the nasal fibers of the retina cross to the other side of the brain and carry information to the higher centers of the visual brain.
Therefore, a lesion in the optic chiasm affects the nasal hemianopdia of both retinas.
Bitemporal Hemianopia Caused by Retinal Disease
When this interruption in the circuit occurs, there is a loss of information from both external visual fields. The most common cause reported for bitemporal hemianopia is trauma.
The trauma in the middle optic nerve. Also the compression of the optic chiasm causes the disturbance in the vision since the impulses can not be transferred due to the compression bitempral the area.
The closest gland that is found is known as the pituitary gland, so any type of trauma to the pituitary gland such as pituitary adenomas and craniopharyngiomas can also be the cause of this condition.
Other causes include neoplastic trauma such as meningioma it is the tumor in the meningeal tissue of the brain. Whenever there is compression of the chiasm, the communicating artery may show an aneurysm.
Any type of injury or defect in the pituitary gland is observed with neuroimaging. Magnetic resonance imaging and high-resolution computed tomography are also useful hemiaanopsia diagnosing the cause of bitemporal hemianopia. Some laboratory tests are also performed to verify the performance of the endocrine glands.
These will finally show the functioning of the pituitary gland.
Bitemporal Hemianopsia – MeSH Result
There is no adequate treatment or cure for bitemporal hemianopia, but there may be a surgical removal of the tumor located in the pituitary gland. It is the type of partial blindness in which half of the vision of both external sides of the eye is lost.
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