Question
Visual field defect in lesion at site as “marked by a bar” as shown in the picture below is characteristic of which among the followings ?
A. Glaucoma.
B. Optic neuritis.
C. Pituitary tumor.
D. Retinal detachment.
Show Answer
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Correct Answer » C
Explanation
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Visual field defect in lesion at site as “marked by a bar” as shown in the picture above represents Bitemporal hemianopia.
Characteristic visual field defect of central chiasmatic lesion is bitemporal hemianopia. Pituitary tumor causes central chiasmatic lesion.
Bitemporal hemianopia results due to central (sagittal) lesion of the optic chiasma, common causes of which are tumors of the pituitary gland (most common), craniopharyngioma, suprasellar meningioma, glioma of third ventricle, chiasmal arachnoiditis, and third ventricular dilatation.
