CN exam Flashcards
what is visual field confrontation a good test for
Tests globally but also tests for glaucoma too and glaucoma causes tunnel vision so peripheral vision is more impaired
what will a lesion to the optic chiasm cause
will cause bitemporal hemianopsia (loss of half of visual field, opposite for both eyes)
What will a lesion of the right optic tract/ radiation cause
Left homonymous hemianopsia (gunna lose left visual field)
If you shine light in a normal eye will u still get pupil constriction in the blind eye
Yes as sympathetic innervation is still there
wont work other way around tho
What will you see in papilledema
Pt reports normal vision but lots of swelling and engorgment of optic disc
What will you see in glaucoma
increased intraocular presure and optic disc is pushed back
What will you see in macular degeneration
Patchiness in retina, no vision in these areas
-progressive blindness
What will you see in optic atrophy
White disc indicates atrophy and small blood vessels missing
What is anisocoria
Unequal pupil size (20% have it normally)
what actiion of the sup oblique
normally- looks down and ou
What is the corneal reflex testing
sensory compinent CNV, blinking from CN7
What would a peripheral lesion to the facial nerve cause
Would affect entire half of face.
what would a central lesion of the facial nerve cause, where does innervation of each quadrent of the face get input from
Some sparing of a quadrent of the face
Upper quad- gets inn from ipsilate and contralat
Lower quad- gets inn from contralat
Sensirineural vs conductive hearing loss
Sensirineural- loss of auditory nerve/cochlea
Conductive- problem with sound traveling to inner ear
ex. Weber lateralizes to right, Rinne pos bilat (ac>bc)
Left sensirneurla loss
