Ch11 The Visual System Flashcards
(34 cards)
list the Visual System pathways:
- Lateral Geniculate nucleus to occipital lobe
2. Extrageniculate fibers initiate – Direct, indirect light reflex, auditory reflex, coordination of gaze
Occipital Lobe Areas
17
18
19
Area 17 function
the primary visual cortex
Area 18 function
secondary visual cortex (visual association cortex) - recognition
Area 19 function
for memory to recall the appearance of an object or person not currently in view
Assessment of Visual Disturbances consist of how many stpes
2
Nature of disturbance: includes
time
progression
are there bright (+) or dark (-) areas
Def: non-specific term, can indicate possible scotoma, possible diplopia, possible eye fatigue or many others
Blurry vision
Visual acuity testing includes
Blink to threat Myopia Hyperopia Presbyopia Visual field testing
nearsighted 20/80 is called
Myopia
farsighted 20/15 is called
Hyperopia
old age vision is called
Presbyopia
optic nerve and oculomotor nerve testing is called
Visual field testing
Bitemporal Hemianopia is loss of
bilateral peripheral vision
Bitemporal Hemianopia sight of lesion
optic chiasm
Homonymous Hemianopia is loss of
right side of each eye vision
Homonymous Hemianopia Lesion site:
left lateral geniculate nucleus problem
Left Inferior Quadrantanopia is Loss of
left inferior quadrant of vision
Left Inferior Quadrantanopia Lesion site:
right parietal radiations (dorsal stream)
Right Superior Quadrantanopia is loss of
right superior quadrant of vision
Right Superior Quadrantanopia Lesion site:
left temporal radiations
Retinal Vascularity:
Define Amaurosis fugax
brown out of vision descending curtain from TIA
Retinal Vascularity is caused by
blockage of the arteries of the retina (TIA in brain)
Inferior Fluid Line Hemorrhage causes what defect?
shifting superior visual defect
