Visual System - Lesions

Question 1

Lesion to visual association cortex

Answer 1

Disorders of higher-order visual processing

Question 2

Lesion of retina or optic nerves

Answer 2

Produce monocular visual field defects (A,B)

Question 3

Lesions to optic chiasm

Answer 3

Bitemporal visual field deficits (C)

Question 4

Lesions posterior to chiasm

Answer 4

(Optic tracts, LGN, optic radiations, visual cortex)

Homonymous visual field changes - defect in same region for both eyes

Question 5

Lesions to optic radiations

Answer 5

Homonymous defects affecting the contralateral visual field

Question 6

Lesion of ipsilateral optic radiation

Answer 6

Contralateral homonymous hemangioma a visual field defect (G)

Question 7

Temporal lobe lesion

Answer 7

Contralateral homonymous superior quadrantopia “pie in the sky” visual field defect (E)

Question 8

Lower parietal lobe lesion

Answer 8

Contralateral homonymous inferior quadrantopia “pie on the floor” visual field defect (f)

Question 9

Lower bank lesion

Answer 9

Contralateral homonymous superior quadrantanopia

Question 10

Lesion to ther right lower back of PVC would cause what visual field defect?

Answer 10

Left superior quandrantanopia

Question 11

Upper bank lesions

Answer 11

Contralateral homonymous inferior quadrantanopia

Question 12

Lesion to right upper bank of PVC would cause?

Answer 12

Left inferior quadrantanopia

Question 13

Lesion of the retina

Answer 13

Area of retina damaged would reflect damage to associated visual field.
Causes: infarcts, hemorrhage, degeneration, infection

Question 14

Complete lesion of the optic nerve

Answer 14

Information from entire retina of that eye

Causes: glaucoma, optic neuritis, neuropathy, elevated ICP, tumors, trauma

Question 15

Lesion involving the entire retina

Answer 15

Monocular vision loss

Question 16

Lesion of optic chiasm

Answer 16

Causes: pituitary adenoma, hypothalamus glioma, other tumors

Susceptible to pituitary tumors or other lesions in this area

Question 17

Lesions of the optic tract

Answer 17

Causes: tumor, infarct, demylelination

Question 18

Lesion to LGN

Answer 18

Cause contralateral homonymous hemaniopia

Question 19

Lesions of entire optic radiations

Answer 19

Infarct, tumor, demyelination, trauma, hemorrhage

Question 20

Lesions of entire PVC

Answer 20

PCA infarcts, tumor, infection

Question 21

Lesion in parietal lobe

Answer 21

MCA superior division infarcts

Question 22

lesion to upper bank of calcarine fissure

Answer 22

PCA infarcts, hemorrhage, tumors, infection, trauma to occipital pole.

Question 23

Lesion in temporal lobe

Answer 23

MCA inferior division infarcts

Question 24

Lesion to lower bank of calcarine fissure

Answer 24

PCA infarcts, hemorrhage, tumors, infections, trauma to occipital pole

Question 25

Partial lesion to visual pathways

Answer 25

Sometimes result in ventral visual field being spared

Question 26

Lesion to occipital pole

Answer 26

Area represented by fovea and macula and would result in visual loss in the center of the visual field