CVF Flashcards
physiologic blind spot is where
optic nerve leaves eye
avg blind spot
5.5 wide and 7.5 high
on visual field blind spot is
15 degree temporal & slightly below horizontal meridian
area inside field of vision not seen is
a scotoma
physiologic blind spot is
absolute scotoma
disease of retina & optic nerve will cause ____ defects in visual field that only affect field of vision in 1 eye unless both involved
pre-chiasmal
the nasal retina sees objects in
temporal visual field
superior retina sees objects in
inferior visual field
the temporal retina sees objects in _____ visual field
nasal
the inferior retina see objects in the ____ visual field
superior
altitudinal defects
defects affecting superior/inferior field and only respect horizontal line
quadrantopia
quadrant of visual field missing respects horizontal and vertical line
hemianopia
half of visual field is missing & respects vertical line
post chiasmal defects
optic tracts, lateral geniculate body, optic radiations & optical cortex
post chiasmal disease causes visual field defects on the ____ side of both eyes called ___
same
homonymous hemianopias
pituitary tumor presses on ___ and cause ____ affecting temporal field in both eyes
optic chiasm
bitemporal hemianopia
visual pathway
retina optic nerve optic chiasm optic tracts lateral genicualte body optic radiations occipital (visual) cortex
compression of the lower _____ can result in a superior homonymous quadrantopia
temporal lobe radiation fibers
compression of upper parietal lobe radiation fibers can result in _____
inferior homonymous quadrantopia
boundaries of the VF range ___ superiorly & nasally, ___ inferiorly, and ___ temporally (total of 150 horizontally & 135 vertically)
60
75
90
____ targets are more precise bc they present a finer stimulus to the retina and are easily identifiable
stationary
