Visual Field Flashcards
where is the lateral geniculate nucleus?
on thalamus
ispalateral means
same side of optic tract
After synapsing at LGN, what happens?
signals go to primary visual cortex
Baum’s loop
contains the inferior picture
which synapses superiorly (cuneus)
goes through parietal lobe
Meyer’s loop
contains the superior picture
which synapses inferiorly (lingual)
goes through temporal lobe
optic tract means …
pre-LGN
optic radiation means …
post-LGN
Where is the primary visual cortex located?
the occipital lobe
What happens after the primary visual cortex?
we project signals to more anterior portions of the brain to understand visual information
scotoma
blind spot
Marcus Gunn pupil
a type of afferent pupil defect
when you shine light in eye, one pupil does not constrict as much as the other
present in optic neuritis
Where does every eye have a scotoma?
at the optic disc
Is optic neuritis monocular or binocular?
monocular
What words do we use when describing binocular lesions?
homonymous
ipsalateral / contralateral
hemianopia
What happens at the tissue level of optic neuritis?
autoimmune system damages myelin of the optic nerve
this causes a diminished signal from optic nerve
describe an occipital stroke effects on eyes
contralateral homonyous hemianopia
*affects both eyes suddenly, lose same half of vision
describe a retinal artery occlusion
monocular field loss
afferent pupil defect
retina is pale on funduscopy
embolic stroke of optic nerve
describe ischemic optic neuropathy
swollen optic nerve
afferent pupil defect
stroke of optic nerve
monocular inferior vision loss
functional vision loss
pupils are fine
lost vision in one eye
behavioral problem!
Compare and contract optic neuritis vs. retinal artery occlusion
Compare: both have APD and are monocular
Contrast: optic neuritis is subacute, retinal artery occlusion is sudden
