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Bitemporal hemianopsia | Bitemporal Hemianopia | Drk
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Bitemporal hemianopsia (or bitemporal hemianopia) describes the ocular defect that leads to impaired peripheral vision in the outer temporal halves of the visual field of each eye.
What causes a bitemporal hemianopia?
A bitemporal hemianopia is almost always caused by damage to the optic chiasm and can occur from the direct or indirect effects of a variety of lesions, including tumors,1 aneurysms,2 and, less frequently, inflammatory and ischemic diseases.
Why does pituitary tumors cause bitemporal hemianopia?
A pituitary tumor frequently causes bitemporal hemianopia by compressing the optic chiasm initially. Visual field defects are thought to be due to the direct compression or the effect on the blood supply of the optic chiasm.
What is the most common cause of hemianopia?
The most common cause of this type of vision loss is stroke. However, any disorder that affects the brain — including tumors, inflammation and injuries — can be a cause. It is estimated that 70% of the injuries leading to hemianopsias are due to an obstruction (blockage) of the blood supply (stroke).
What is bilateral hemianopia?
defective vision or blindness in half of the visual field; usually applied to bilateral defects caused by a single lesion.
How is bitemporal hemianopia diagnosed?
The diagnosis study of choice for bitemporal hemianopia is visual field testing. Visual field testing by Standard Automated Perimetry(SAP) with favorable sensitivity and early detection is preferred over Goldmann perimetry and is most common method used.
What causes homonymous hemianopia?
Causes. Homonymous hemianopsia can be congenital, but is usually caused by brain injury such as from stroke, trauma, tumors, infection, or following surgery. Vascular and neoplastic (malignant or benign tumours) lesions from the optic tract, to visual cortex can cause a contralateral homonymous hemianopsia.
What causes Binasal hemianopia?
However, in this study, the cause for the binasal hemianopia was found to be ischemic optic neuropathy in two patients, and one case each of optic nerve drusen, glaucoma, congenital optic nerve pits, and retinitis pigmentosa sine pigmento. Thus 75% of the cases had an intraocular cause for the binasal hemianopia.
What brain tumor can cause bitemporal hemianopia?
Bitemporal hemianopsia most commonly occurs as a result of tumors located at the mid-optic chiasm. Since the adjacent structure is the pituitary gland, some common tumors causing compression are pituitary adenomas and craniopharyngiomas. Also, another relatively common neoplastic cause is meningiomas.
Bitemporal hemianopsia (or bitemporal hemianopia) describes the ocular defect that leads to impaired peripheral vision in the outer temporal halves of the visual field of each eye.
What causes a bitemporal hemianopia?
A bitemporal hemianopia is almost always caused by damage to the optic chiasm and can occur from the direct or indirect effects of a variety of lesions, including tumors,1 aneurysms,2 and, less frequently, inflammatory and ischemic diseases.
Why does pituitary tumors cause bitemporal hemianopia?
A pituitary tumor frequently causes bitemporal hemianopia by compressing the optic chiasm initially. Visual field defects are thought to be due to the direct compression or the effect on the blood supply of the optic chiasm.
What is the most common cause of hemianopia?
The most common cause of this type of vision loss is stroke. However, any disorder that affects the brain — including tumors, inflammation and injuries — can be a cause. It is estimated that 70% of the injuries leading to hemianopsias are due to an obstruction (blockage) of the blood supply (stroke).
What is bilateral hemianopia?
defective vision or blindness in half of the visual field; usually applied to bilateral defects caused by a single lesion.
How is bitemporal hemianopia diagnosed?
The diagnosis study of choice for bitemporal hemianopia is visual field testing. Visual field testing by Standard Automated Perimetry(SAP) with favorable sensitivity and early detection is preferred over Goldmann perimetry and is most common method used.
What causes homonymous hemianopia?
Causes. Homonymous hemianopsia can be congenital, but is usually caused by brain injury such as from stroke, trauma, tumors, infection, or following surgery. Vascular and neoplastic (malignant or benign tumours) lesions from the optic tract, to visual cortex can cause a contralateral homonymous hemianopsia.
What causes Binasal hemianopia?
However, in this study, the cause for the binasal hemianopia was found to be ischemic optic neuropathy in two patients, and one case each of optic nerve drusen, glaucoma, congenital optic nerve pits, and retinitis pigmentosa sine pigmento. Thus 75% of the cases had an intraocular cause for the binasal hemianopia.
What brain tumor can cause bitemporal hemianopia?
Bitemporal hemianopsia most commonly occurs as a result of tumors located at the mid-optic chiasm. Since the adjacent structure is the pituitary gland, some common tumors causing compression are pituitary adenomas and craniopharyngiomas. Also, another relatively common neoplastic cause is meningiomas.
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