What causes left superior quadrantanopia?

A superior quadrantanopia results from an insult to the optic radiation inferiorly in the temporal lobe, resulting in a ‘pie in the sky’ type of visual field defect (Figure 1d), while an inferior quadrantanopia is caused by damage to the parietal lobe optic radiation (Figure 1e).

What causes left homonymous inferior quadrantanopia?

A lower homonymous quadrantanopia describes the loss of the same upper quadrant from each visual field. Lower homonymous quadrantanopias are usually caused by damage to the optic radiation as it passes throught the parietal lobes.

What lesion causes quadrantanopia?

Quadrant anopia It can be associated with a lesion of an optic radiation. While quadrantanopia can be caused by lesions in the temporal and parietal lobes, it is most commonly associated with lesions in the occipital lobe.

What is a homonymous quadrantanopia?

Homonymous quadrantanopsia is defined as the visual loss that is restricted to one quadrant of the visual field and is comparable in both eyes.

What part of the brain causes homonymous hemianopia?

As for the areas of the brain most affected, 40% of homonymous hemianopsias originate in the occipital (rear) lobe of the cerebral hemisphere.

What is left inferior quadrantanopia?

quadrantanopia, inferior. An inferior homonymous loss of vision in two quarters due to a lesion of the superior fibres of the optic radiations in the parietal lobe on the contralateral side of the visual pathway.

What causes unilateral quadrantanopia?

Conclusion : Unilateral quadrantanopia appears to have been caused by pituitary tumor with intratumor hemorrhage, or pituitary apoplexy, that compressed the posterior portion of optic chiasm upwards.

What is homonymous quadrantanopia?

Homonymous superior quadrantanopia, also called “pie in the sky,” causes a field deficit in the superior field of both eyes for the same side. This visual field deficit is bilateral and involves retrochiasmal pathways.[1]

What is superior visual field defect?

A visual field defect is a loss of part of the usual field of vision, so it does not include severe visual impairment of either one eye or both. The lesion may be anywhere along the optic pathway; retina to occipital cortex.