Lecture 1: Vision lesions Flashcards
So a guy comes in and lost vision in his whole RIGHT eye, where is the lesion?
RIGHT optic nerve
Pt comes in with vision loss on the right lateral and left lateral vision fields, where is the lesion?
Optic Chiasm
A lesion at the optic chasm causes what kind of vision loss?
Bitemporal hemianopia
A lesion at the optic tract causes what kind of vision loss?
contralateral homoymous hemianopia
ie: if the lesion is on the right optic tract, it will cause left homonymous hemianopia
Describe the vision loss in: homonymous hemianopia
loss of the same side of vision in BOTH eyes
Describe the vision loss in: bitemporal homonymous
loss of temporal fields in BOTH eyes
Ptosis + Miosis + Anhydrosis = ____
HORNERS
Damage to Posterior Commissure =
NO consensual light reflex; Normal direct light reflex
Damage to Optic Chiasm=
NO consensual light reflex; Normal direct light reflex & Bitemporal Hemianopia- Lateral half vision loss bilateral eye
Damage to Occulomotor N=
IPSILATERAL lateral strabismus, diplopia, pupillary dilation, ptosis, paralysis
Damage to Trochlear N=
Diplopia of some eye movements (walking down stairs); No strabumus/ptosis
Damage to Abducens N=
IPSILATERAL medial strabismus, diplopia; NO ptosis, normal pupils
Damage to Medial Longitudinal Fasciculus
Diplopia, NO horizontal gaze to affected side. NO strabismus, ptosis, normal pupils
Damage to Frontal eye fields via stroke= (where do eyes move)
Eyes deviated to AFFECTED side; cant do saccadic mvmts to damaged side
Damage due to Seizure= (where do eyes move)
Eyes deviated to NORMAL side; cant do saccadic mvmts to normal side
