Visual field defects Flashcards
What does left homonymous hemianopia indicate?
Visual field defect to the left, indicating a lesion of the right optic tract.
What are homonymous quadrantanopias?
Visual field defects categorized as PITS: Parietal-Inferior, Temporal-Superior.
What is the difference between incongruous and congruous defects?
Incongruous defects indicate an optic tract lesion; congruous defects indicate an optic radiation lesion or occipital cortex.
What is a congruous defect?
Complete or symmetrical visual field loss.
What is an incongruous defect?
Incomplete or asymmetric visual field loss.
What is macula sparing?
A lesion of the occipital cortex.
What causes superior homonymous quadrantanopia?
Lesion of the inferior optic radiations in the temporal lobe (Meyer’s loop).
What causes inferior homonymous quadrantanopia?
Lesion of the superior optic radiations in the parietal lobe.
What does PITS stand for?
Parietal-Inferior, Temporal-Superior visual field affected.
What causes bitemporal hemianopia?
Lesion of the optic chiasm.
What does upper quadrant defect > lower quadrant defect indicate?
Inferior chiasmal compression, commonly due to a pituitary tumor.
What does lower quadrant defect > upper quadrant defect indicate?
Superior chiasmal compression, commonly due to a craniopharyngioma.
What is the likely diagnosis for a 19-year-old female with bitemporal hemianopia affecting lower quadrants?
Craniopharyngioma.
What is associated with a pituitary adenoma?
Bitemporal hemianopia due to optic chiasm compression.
What visual defect results from a left temporal lobe infarct?
Right superior quadranopia.
What visual defect is associated with diabetes insipidus due to craniopharyngioma?
Lower bitemporal hemianopia.
What visual defect results from a left parietal lobe infarct?
Right inferior quadrantanopia.
What is the likely diagnosis for an 11-year-old boy with bitemporal superior quadrantanopia and short stature?
Pituitary adenoma.
Where is the lesion for a left homonymous hemianopia?
Right optic radiation or occipital cortex.
What visual defect is a man at risk of after meningioma removal in the left temporal lobe?
Right superior homonymous quadrantanopia.
What lesion causes left homonymous hemianopia with macula sparing?
Occipital cortex.
What lesion is indicated by bitemporal hemianopia with headaches and sweating?
Optic chiasm due to pituitary tumor.
What is the likely site of lesion for a 30-year-old man developing ‘tunnel vision’?
Retina.
What lesion causes bitemporal hemianopia with upper quadrants affected?
Pituitary Macroadenoma.
