lecture 7 visual field Flashcards
Chiasm about ___ fibers cross
half
80% of the post chiasmal fibers continue to the (lateral geniculate nucleus/pretectal nucleus)
lateral geniculate nucleus
20% of the post chiasmal fibers go to the (lateral geniculate nucleus/pretectal nucleus) to control the pupils
pretectal nucleus
hemianopsia is describing a visual field defect of the (entire/half) of each eye’s field
half
Bitemporal hemianopsia affect R and L nasal fibers therefore lesion must be where?
central optic chiasmal
Right hemianopsia will show a lesion of ___ chiasmal
post
Nerve fibers enter teh LGN whcih have ___ layers
6
Layers 1 and 2 are (parvocellular/manocelleualr)
magnocelleualr-moving stimuli
layers 3,4,5,6 are (parvocellular/manocelleualr)
parcocellular-color acuity
ipsilateral temporal layers fibers go to layers ___
2,3,5
contralateral nasal fibers go to layers
1,4,6
A (annular/arcuate) scotoma is arc-shaped caused by damage to the retinal nerve fiber bundles
arcuate
A (annular/arcuate) is usually located 20-40 degrees from central fixatio
annular or ring
______ introduced a bowl perimeter that controlled retinal adaptation, fixation, target size and intensity
goldmann
In a normal visual field the extent of :
Nasal: _ degrees
Superior: _ degrees
Inferior: \_\_ degrees
Temporal: \_\_\_ degrees
Binocular overlap
\_\_degrees
60, 60,75,100,120
nasal fibers represent ____ visual field
temporal
inferior fibers repesent ____ visual field
superior
What are the thre types of cells in the Lenticular geniculate nucleus?
konio, magno, parvo
which one is the thickest of the three types of cells in the lenticular geinculate nucleus and how many layers does it have?
magno 2
Which one of the cells in the lenticular geniculate nucleus has the most amount of layers and how many does it have?
konio 6
How many layers does the parcocellular have in the lenticular geniculate nucleus? A)2 B)5 C)6 D)4
4
Inferior fibers represent the superior visual field and they travel via ____ loop to the temporal lobe
meyers
LGN is a ____ station for fibers
relay
Inferior fibers travel via (parietal/temporal)
parietal
superior fibers travel via (temporal/parietal)
temporal
- 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
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
In visual field defect (hemianopia/quadrantnopia/altitudinal) is when an entire hemi-field, nasal or temporal is affected
hemianopia
In visual field defect (hemianopia/quadrantnopia/altitudinal) is when an entire quadrant of visual field is involved
quadrantanopia
In visual field defect (hemianopia/quadrantnopia/altitudinal) is when superior and inferior field defects are known as altitudinal defects
altitudinal
The more posterior the lesion the more (incongruous/congruous) the visual field defect will be between teh two eyes
congruous
(Incongruous/congruous) describes a visual field defect to be relatively similar in location and size
congruous
Name the three types of confrontation visual fields
static, kinetic, facial amsler
In the confrontation static visual field test fingers represent 20/___ at ___ degrees
200,20
T/F In the confrontation static visual field test you need to be at a working distance of 50-60 cm
T
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
8
20-30
T/F in the kinetic counting fingers visual field test you want to ask the patient to hold the occluder
T
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?
eyes, chin, ears
T/f in the facial amsler test you want to occlude one eye
T
in the amsler grid test each block is ___ degree at 30cm
one
The central macular field is ___degrees in the amsler grid test
A)20
B)15
C)10
10
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)
amsler grid
Should glasses be on or off in teh amsler grid procedure?
on
how far away does the grid need to be from pt when doing the amsler grid test
30cm
what are you testing when doing the amsler grid test?
central vision
