VIsual Pathways and Lesions Flashcards
Within the eye, arrange the order that visual info is transmitted [optic nerve, bipolar cells, photoreceptors, retinal ganglion cells]
photoreceptors-bipolar cells-retinal ganglion cells-optic nerve
The optic nerve synapses at _ . From here, fibers travel superiorly and inferiorly to the primary visual cortex
Lateral geniculate nucleus
What is perimetry?
A technique to detect the visual field acuity. Pt focuses on center, objects brought into visual field from periphery
What is a preneural visual field defect?
A defect before visual retinal ganglion cells
A mono-ocular lesion that respects the horizontal meridian is likely to be _
A retinal defect
Glaucoma and papilledema are examples of _
Optic field defects
A scotoma, loss of visual acuity, loss of color vision, RAPD are all synptoms of _
Optic nerve defect
Bitemporal hemianopsia is a hallmark of _
Optic chiasm defects
Lesions in the temporal portions of the optic tract results in _ (Optic radiations)
Quadrantanopia (pie in the sky)
Lesions in the parietal protions of the optic tract results _
Quadrantanopia (inferior)
What is macular sparing?
Lesions very close to the occipital pole tend to spare the macula
The closer a lesion is to the occipital lobe, the _ it becomes
The more congruous it becomes
Regarding optic lesions, the midline rule refers to _
Lesions that occur at or behind the optic chiasm, they tend to respect the midline
The fibers from the inferior retina represent the _ visual field. They stay inferior (and vice versa)
Superior
