Exam 3 Week 14 ppt 6 visual pathology Flashcards
What is Optic neuritis?
-Inflammatory demyelinating disorder often related to multiple sclerosis -Symptoms of eye pain, decreased acuity, and impaired color vision -Recovery is common
What is Papilledema?
Optic disc swelling associated with elevated intracranial pressure
What happens if damage to optic nerve?
Monocular visual loss
What happens if there is a lesion of the optic chiasm?
Loss of peripheral vision Bi-temporal hemianopsia
What happens if there is a complete lesion of optic tract fibers (D, G or H)?
-Loss of half of visual field – contralateral to damage -Contralateral homomynous hemianopsia
what is Macular sparing?
-Vascular lesions of the occipital lobe -Both MCA and PCA supply the cortical area representing the macula
one of the first signs of MS
Visual disturbances -Optic neuritis -Scotoma -Visual field defects
What is Scotoma?
partial alteration visual field with diminished or degenerated visual acuity that is surrounded by a field of normal/relatively well-preserved vision
What phase of classic migraine involves visual cortex?
Prodromal phase
Two facts about migraines and visual cortex
- One-third of migraine sufferers experience a visual aura 2. 10% of people with migraine experience a scintillating scotoma (fixed or expanding spot of flickering light near or in the center of the visual field)
What is the name of the syndrome associated with lesions of the parieto-occipital lobe?
Balint’s syndrome
3 deficits seen with Balint’s syndrome
- Simultagnosia 2. Optic ataxia 3. Ocular apraxia
What is Simultagnosia?
can see only small parts of the visual field at a time – difficulty comprehending large visual areas
What is Optic ataxia?
impaired ability to point to or reach for an object
What is Ocular apraxia?
difficulty directing gaze toward an object in peripheral field
