visual disorders Flashcards
The fovea has a large concentration of (rods/cones).
cones
What is the function of rods and cones?
Cones: provide color
Rods: provide black and white
Do rods or cones have the best resolution?
cones
Where do ALL of the axons of the ganglion cells go?
Lateral Geniculate nucleus via the optic nerve/tract
definition: area found in the eye that activates/deactivates a ganglion cell
receptive body
What do the ganglion cells turn into?
Optic nerve
Which ganglion cells cross over in the optic chiasm?
Layers 1, 4, and 6
Where does the output of the lateral geniculate nucleus go to? How do they get there?
visual cortex (area 17) via optic radiations
definition: fibers of the lateral geniculate nucleus that passes through the temporal lobe
meyer’s loops
What lobes help with visual processing?
occipital, temporal, parietal
What is the visual function of the temporal lobe?
object recognition
What is the visual function of the parietal lobe?
spatial recognition
What is the visual function of the superior colliculus?
Used in coordinating eye-head movements via tectospinal pathway
What is the visual function of the suprachiasmatic nucleus (part of hypothalamus)?
involved in circadian rhythm
definition: lesion that results in no visual in the corresponding eye
optic nerve cut
definition: lesion that results in the lateral visual fields of each eye not having visual information
optic chiasm lesion/ bitemporal hemianopsia
example:
L hemianopsia: not being abble to see the L visual field in each eye
optic tract lesion/ homonymous hemianopsia
definition: sparing the visual cortex dedicated to the fovea
macular sparing
Visual cut disorders are tested by a CN __ exam.
CN I
What does parietal lobe damage result in?
problem sensing movement
What does temporal lobe damage result in?
problem recognizing objects
