Short Description or Definition
A hemianopia refers to a loss of vision in one-half of the visual field.
There are various subtypes of hemianopia that are caused by different lesions along the visual system. A bitemporal hemianopia can occur by damage to the optic chiasm. This is usually caused by intercerebral masses that press against the chiasm, such as a pituitary adenoma, meningioma, craniopharyngioma, or hypothalamic glioma. Lesions of the lateral geniculate nucleus in the thalamus may result in a contralateral homonymous hemianopia. Other visual defects can occur that result in a quadrantanopia, which is a loss of vision in selected visual field quadrants. These occur in lesions of the temporal lobe in the optic radiations. However, damage to the entire optic radiation on one side can cause a contralateral homonymous hemianopia.
Natural History, Prognostic Factors, and Outcomes
Hemianopia can be caused by a brain tumor, stroke, or trauma to the brain. An embolic...
References and Readings
- Daroff, R. B., Jankovic, J., Mazzotta, J. C., & Pomeroy, S. L. (2016). Bradley’s neurology in clinical practice. China: Elsevier.Google Scholar