Classification and Localization of VF Defects (M1)

Question 1

What is a loss of the superior or inferior half of the visual field called?

Answer 1

altitudinal hamianopia

Question 2

What is a depression of sensitivity called? 1. What does this indicate? 2

Answer 2

1. relative defect

2. lesion may be progressive

Question 3

What is a loss of the same half of the visual field in both eyes called?

Answer 3

homonymous hemianopia

Question 4

What is the field defect seen in a lesion located at the right optic tract?

Answer 4

incongruous left homonymous hemianopsia

Question 5

What is the portion of the optic nerve that includes the disk and globe itself?

Answer 5

ocular portion

Question 6

The more posterior in the visual pathway a lesion is located, is the defect more or less congruent?

Answer 6

more congruent

Question 7

What is the field defect seen in a lesion located at the right occipital lobe?

Answer 7

left homonymous hemianopia (macular sparing)

Question 8

What is the field defect seen in a lesion located at the left occipital lobe in the lower bank?

Answer 8

right homonymous upper quadrantanopsia (macular sparing)

Question 9

What is it called when only a portion of the visual field is reduced in sensitivity?

Answer 9

scotoma

Question 10

What is a localized defect that is near or around the normal blind spot called?

Answer 10

cecal or centro-cecal defect

Question 11

Where overall is the lesion most-likely located relative to the chiasm if it is unilateral? 1. Bilateral? 2. If it is a mirror image? 3

Answer 11

1. pre chiasmal
2. post chiasmal
3. chiasmal

Question 12

What are the two special names given to sector defects?

Answer 12

1. hemianopia

2. quadrantoanopia

Question 13

What is a defect specific to loss of sensitivity in a particular bundle of RNFL fibers called? 1. Is this usually unilateral or bilateral? 2

Answer 13

1. nerve fiber bundle

2. unilateral

Question 14

What is the field defect seen in a lesion located at the left lateral geniculate nucleus?

Answer 14

right homonymous quadruple sectoranopia
OR
right homonymous sectoranopia

Question 15

What is the field defect seen in a lesion located near the left temporal lobe?

Answer 15

right homonymous upper quadrantanopsia

Question 16

What is a complete loss of sensitivity called?

Answer 16

absolute defect

Question 17

What is the field defect seen in a lesion located at the left occipital lobe in the upper bank?

Answer 17

right homonymous lower quadrantanopsia (macular sparing)

Question 18

What is the portion of the optic nerve that runs through the optic foramen?

Answer 18

intracanalicular portion

Question 19

What is the field defect seen in a lesion located at the chiasm?

Answer 19

bitemporal hemiamopsia

Question 20

What is the field defect seen in a lesion located near the left parietal lobe?

Answer 20

right incomplete homonymous hemianopia (denser inferiorly)

Question 21

What is the portion of the optic nerve that is in the cranial cavity to the chiasm?

Answer 21

intracranial portion

Question 22

What is the portion of the optic nerve that runs through the orbit?

Answer 22

intraorbital portion