CN II Optic Visual Field Deficits Flashcards
Blindness - Ipsilateral loss of vision?
Injury to eye itself, retina or optic nerve
Blindness - Bilateral loss of vision?
Injury to both eyes, both optic nerves, or complete optic chiasm
Hemianopia/Hemianopsia is?
Loss of 1/2 of the visual field of both eyes
Names for the side of the visual field deficit, not the location of injury
What are the two different types of Hemianopia/Hemianopsia?
Bitemporal
Homonymous
What is Bitemporal Hemianopia?
-Loss of both lateral visual fields
- Lesion of central pattern of the optic chiasm
- Most often secondary to pituitary tumor
What is Homonymous Hemianopia?
Loss of visual field in both eyes that is contralateral to the side of lesion
Lesion for Homonymous Hemianopia are located on?
Lesion of one optic tract
Lesion of one lateral geniculate nucleus
Lesion of one entire primary visual cortex
Lesion of both the superior and inferior optic radiation in one hemisphere
What is Left Homonymous Hemianopia?
Often associated with left sided neglect (a problem with attention)
What is Homonymous Quadrantanopia?
Loss of 1/4 of a visual field in both eyes
- Damage to one optic radiation or one bank of the calcarine fissure
- Loss of visual field that is contralateral and inverse from the location of the lesion
What happens when damage to left superior optic radiation or left upper bank of calcarine fissure?
Right inferior Homonymous Quadrantanopia
What happens when damage to right superior optic radiation or right upper bank of calcarine fissure?
Left inferior Homonymous Quadrantanopia
What happens when damage to left inferior optic radiation or left lower bank of calcarine fissure?
Right superior Homonymous Quadrantanopia
What happens when damage to right inferior optic radiation or right lower bank of calcarine fissure?
Left superior Homonymous Quadrantanopia
