Causes of Homonymous Hemianopia
Homonymous hemianopia is a visual impairment that occurs when there is a lesion in the post-chiasmal part of the visual pathway, resulting in the inability to perceive either the right half or the left half of the visual world of each eye. This condition is primarily caused by an obstruction of the blood supply, with approximately 70% of cases being attributed to strokes along the optic tract and brain structures such as the lateral geniculate body and the occipital lobe of the cerebral hemisphere.
Individuals who are affected by homonymous hemianopia are more likely to have underlying diseases that impact the circulatory system, including arterial hypertension and diabetes. However, it is important to note that any disorder affecting the brain, such as tumors, inflammation, and injuries, can also lead to the development of this visual impairment.
Conclusion
Hemianopia and visual field defects resulting from stroke can have a significant impact on an individual’s daily activities, including personal hygiene, reading, mobility, and driving. However, there is hope for improvement, especially during the acute stage of stroke. In fact, some patients may experience a rapid and complete resolution of their visual field defects if the vascular injury is limited. It is important to note that even patients with a sizable lesion still have the potential for improvement, which is likely attributed to the resolution of cerebral edema. This underscores the importance of timely assessment and treatment for stroke patients to maximize their chances of visual recovery.