Visual Field Defects Flashcards Preview

Neuroscience > Visual Field Defects > Flashcards

Flashcards in Visual Field Defects Deck (66):
1

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Left Optic Nerve

2

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chiasm

(lose temporal field)

3

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right optic tract (3) 

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4

____ is  used to assess, diagnose, and monitor
progression of ophthalmologic and neurological conditions

Perimetry

5

What does the visual sensitivty/threshold depend on? (3)

1. age, attention level, refractive statu

2. pupil size, media opacity,

3. stimulus :size/intensity/color/duration/movement

6

Kinetic perimetry is ___

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seeing motion

7

when will you see a small dull stimuli?

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not until it gets to a fixation point

(as opposed to an elephant you would see immeidately)

8

static permistery involves 

object not moving but going dimmer to birghter

9

What does confrontation examination involve?

just theexaminer,no standardized method.

 

Possible strategies:
• use examiner's face
• finger counting
• finger or hand moving
• palms side by side close to midline 1
(for relative hemianopias) • red object

10

Pros of confornation visual field exam are:

its inexpensive, fast, practical

11

Cons of confornation visual field exam are:

its examiner and examinee dependent

12

General and practical rules of confrontation visual field exam are

examiner is one arm length away, showing the object half that distance

examiner closes contralateral eye

13

What does an Amsler grid test?

teststhe central 10’ of the VF


• Ptreportsanyarea missing, blurred or distorted

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14

What does tangent screen test?

the central 20 ’of the VF

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15

___ may be used as pseudo static stimuli

tangent screen

16

What does goldman test

almost the entire visual field

17

What is the test where the pt faces the bowl and fixates on a peep hole?

What does it measure?

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1. Goldman

manualkineticbutcan also do static stimuli; tests almost entire VF. Vary stimulus sizes and intensities.

 

2. Humphrey Perimeter

automatedstatic, standardized by computer.

Plots blind spot, checks for false positives (sound only) and false negatives (stimulate known seeing area)

18

Differences between goldman perimeter and humphery perimeter?

Humphery is autonmatic static and standardized by a computer

 

Goldman is manual kinetic but can do static

depends on examiner

19

Which test tests for false positives and negatives? How does it do this? 

Humphrey

Checksforfalsepositives (sound only) and false negatives (stimulates known seeing area)

20

Define scotoma

poriton of visual field missing

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21

What is arcuate? What causes it?

arc-shaped scotoma

caused from retinal nerve fiber bundle damage

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22

What is an altiudinal defect?

(superior or inferior defect that respects horizontal meridian) –splits horizontally-

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23

What is a hemianopia?

splits vertically (nasal or temporal defect)

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24

What is a quadranopia?

can't see a quadrant

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25

Homonymous means the defect is on the ___

same side ("both right visual videals are missing)

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26

Congrous means the defect is

similar in both eyes (not necessary similar side?)

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27

What does heternoymous mean?

defect in different sides eg bitemporal 

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28

What is this?

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Incomplete right eye temporal hemianopia

29

What is this?

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Relative right eye temporal hemianopia

(relative/absolute is in terms of stimulus)

30

What is this?

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Absolute right eye temporal hemianopia

31

What devides retina into superior and inferior?

horizontal raphe

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32

What constitutes the nasal-temporal demarcation of the retina?

a vertical line that crosses the fovea

33

In gluacoma you usually see what focal defect of the retina?

arcuate (flowls the fibers)

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34

Lesion of the optic nerve can cause loss of

visual acuity and  color vision

35

these can be characteristic of a __ lesion

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optic nerve

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36

____ retina fibers cross at bottom of chiasm, loop into Wilbrand’s knee

inferior nasal

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37

Sup. Nasal fibers cross at___

the top of the chiasm

38

Why is the maculo protected from minor lesions of the optic chiasm?

the papillomacular bundle crosses AT THE CENTER OF THE CHIASM

39

esion at Wilbrand’s Knee looks like 

Junctional Syndrome or Ant.


Chiasmal Syndrome = complete loss of one eye

+ sup. field defect in other eye, “pie in the sky”

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40

Lesions beyond the optic chiasm all cause ____ field defects

homonymous (same side, e.g. both right field missing

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41

with retina damage, there might be a decrease in

visual acuity

42

retina X can have __ or ___ deficits

general or focal

focal correspond to visible lesions

1. fovea -- central scotoma 

2. glaucoma -- arcuate defect

43

macular fibers that cross at the optic chiasm do so in the __ and ___ portion

central and posterior

44

Anterior Chiasmal Syndrome

you get ___ neuropathy 

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Ipsilateral optic neuropathy: Decrease VA, color vision, RAPD

45

Anterior Chiasmal Syndrome

you get ___ jundctional scotoma with what sx

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Contralateral junctional scotoma with normal VA and color vision

46

the more posterior in the retrochiasmal visual pathway a lesion is the more ___ it is

congruous

47

optic tract leads to ___ field deficit

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48

with otpic tract X, ___ is spared

visual acuity

49

with optic tract X

contralateral ___ and ___ reuslts

contralateral relative afferent pupil defect and hemiparesis (posterior internal capsule)

50

with lgn damage 

 VF tend to be ___ and may be incongruous 

homonymous

51

vascular lesions  of the ___ may cause a sector defect (SECTORANOPIA)

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lgn

52

damage to?

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lgn

53

typical defect of optic radiations is 

homonymous quadrantanopia

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54

anterior lesion of optic raditions affects

meyers loop

55

anterior lesion of optic radiations at meyers loop

right homonymous incomplete supererior quadrantanopia

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56

different between anterior (meyers loop) and posterior lesion of optic radiation

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posteiror lesion does not respect the horizontal meridian

57

parietal optic radiation field loss is

homonymous inferior visual field deficits

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58

Posterior lobe lesion (central field)___% of the cortex devoted to central 10’ of field !

 50

59

lesions of occitial lobe and visual cortex causes in general

Homonymous Congruous
defects

60

Anterior lobe lesion: ____ field loss

Monocular

61

Macular Sparring is common but not exclusive of ____ lobe lesions

occipital

62

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calcarine sulcus field loss

63

Bilateral homonymous hemianopic central scotomas with macular sparring 

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caclcaruine sulcus lesion

64

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left occipital lobe (lower)

65

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left parietal

66

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right temporal