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PPO2 > lecture 7 visual field > Flashcards

lecture 7 visual field Flashcards

1
Q

Chiasm about ___ fibers cross

A

half

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2
Q

80% of the post chiasmal fibers continue to the (lateral geniculate nucleus/pretectal nucleus)

A

lateral geniculate nucleus

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3
Q

20% of the post chiasmal fibers go to the (lateral geniculate nucleus/pretectal nucleus) to control the pupils

A

pretectal nucleus

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4
Q

hemianopsia is describing a visual field defect of the (entire/half) of each eye’s field

A

half

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5
Q

Bitemporal hemianopsia affect R and L nasal fibers therefore lesion must be where?

A

central optic chiasmal

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6
Q

Right hemianopsia will show a lesion of ___ chiasmal

A

post

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7
Q

Nerve fibers enter teh LGN whcih have ___ layers

A

6

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8
Q

Layers 1 and 2 are (parvocellular/manocelleualr)

A

magnocelleualr-moving stimuli

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9
Q

layers 3,4,5,6 are (parvocellular/manocelleualr)

A

parcocellular-color acuity

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10
Q

ipsilateral temporal layers fibers go to layers ___

A

2,3,5

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11
Q

contralateral nasal fibers go to layers

A

1,4,6

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12
Q

A (annular/arcuate) scotoma is arc-shaped caused by damage to the retinal nerve fiber bundles

A

arcuate

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13
Q

A (annular/arcuate) is usually located 20-40 degrees from central fixatio

A

annular or ring

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14
Q

______ introduced a bowl perimeter that controlled retinal adaptation, fixation, target size and intensity

A

goldmann

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15
Q

In a normal visual field the extent of :

Nasal: _ degrees
Superior: _ degrees
Inferior: \_\_ degrees
Temporal: \_\_\_ degrees
Binocular overlap
     \_\_degrees
A

60, 60,75,100,120

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16
Q

nasal fibers represent ____ visual field

A

temporal

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17
Q

inferior fibers repesent ____ visual field

A

superior

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18
Q

What are the thre types of cells in the Lenticular geniculate nucleus?

A

konio, magno, parvo

19
Q

which one is the thickest of the three types of cells in the lenticular geinculate nucleus and how many layers does it have?

A

magno 2

20
Q

Which one of the cells in the lenticular geniculate nucleus has the most amount of layers and how many does it have?

A

konio 6

21
Q 
How many layers does the parcocellular have in the lenticular geniculate nucleus?
A)2
B)5
C)6
D)4
A

4

22
Q

Inferior fibers represent the superior visual field and they travel via ____ loop to the temporal lobe

A

meyers

23
Q

LGN is a ____ station for fibers

A

relay

24
Q

Inferior fibers travel via (parietal/temporal)

A

parietal

25
Q

superior fibers travel via (temporal/parietal)

A

temporal

26
Q
  • Central:
  • Centrocecal:
  • Paracentral:
  • Pericentral:
  • Scotoma:
  • a. absolute or relative area of poor visual function surrounded by a normal visual field
  • b.surrounding fixation
  • c.fixation to blind spot
  • d.adjacent to fixation
  • e.involves fixation
  • Match them
A 
Central: involves fixation
Centrocecal: fixation to blind spot
Paracentral: adjacent to fixation
Pericentral: surrounding fixation
Scotoma: absolute or relative area of poor visual function surrounded by a normal visual field
27
Q

In visual field defect (hemianopia/quadrantnopia/altitudinal) is when an entire hemi-field, nasal or temporal is affected

A

hemianopia

28
Q

In visual field defect (hemianopia/quadrantnopia/altitudinal) is when an entire quadrant of visual field is involved

A

quadrantanopia

29
Q

In visual field defect (hemianopia/quadrantnopia/altitudinal) is when superior and inferior field defects are known as altitudinal defects

A

altitudinal

30
Q

The more posterior the lesion the more (incongruous/congruous) the visual field defect will be between teh two eyes

A

congruous

31
Q

(Incongruous/congruous) describes a visual field defect to be relatively similar in location and size

A

congruous

32
Q

Name the three types of confrontation visual fields

A

static, kinetic, facial amsler

33
Q

In the confrontation static visual field test fingers represent 20/___ at ___ degrees

A

200,20

34
Q

T/F In the confrontation static visual field test you need to be at a working distance of 50-60 cm

A

T

35
Q

In the kinetic counting fingers visual field test you wnt to check a total of how many positions?
you should also test central at __to__degrees

A)20-30
B)15-25
C)10-20

A

8

20-30

36
Q

T/F in the kinetic counting fingers visual field test you want to ask the patient to hold the occluder

A

T

37
Q

What do body parts do you ask the pt to look at when doing the facial amsler test? And what body part do you want them to keep starring at throughout the test?

A

eyes, chin, ears

38
Q

T/f in the facial amsler test you want to occlude one eye

A

T

39
Q

in the amsler grid test each block is ___ degree at 30cm

A

one

40
Q

The central macular field is ___degrees in the amsler grid test
A)20
B)15
C)10

A

10

41
Q 
All patients 50 y and older
All diabetics irrespective of age
History of macular degeneration
Toxic medications
Reduced acuities
--all describe which test? (facial amsler/amsler grid)
A

amsler grid

42
Q

Should glasses be on or off in teh amsler grid procedure?

A

on

43
Q

how far away does the grid need to be from pt when doing the amsler grid test

A

30cm

44
Q

what are you testing when doing the amsler grid test?

A

central vision

PPO2 (15 decks)

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