Lect 3 neuro-opth exam Flashcards
What test can you use for a patient who you think has optic neuritis based on a pale optic nerve ?
a) pupil evaluation
b) contrast sensitivity
c) visual fields
d) stereo
b) contrast sensitivity
(T/F) Dominant optic atrophy causes red-green deficiency
False (this is the exception: acquired optic nerve disease usually produces red-green deficiency, however, dominant optic atrophy causes blue-yellow deficit)
(T/F) If anisocoria is greater in the dark that would indicate a parasymathetic lesion
False. Anisocoria greater in dark=sympathetic and greater in light=parasympathetic
Dilation lag is characterized by which of the following?
a) pupils begin constricting after 10 seconds in the light
b) consensual light reaction present
c) pupils begin dilating after 10 seconds in the dark
d) none of the above
e) both B and C
c) pupils begin dilating after 10 seconds in the dark [dilation lag is usually due to sympathetic denervation (Horner’s)]
Light/near dissociation indicates a lesion at which of the following?
a) dorsal midbrain
b) ventral midbrain
c) pons
d) cerebellum
a) dorsal midbrain
(T/F) Optokinetic nystagmus is difficult to suppress conciously
true (nystagmus always has a slow phase)
Which one of the following is NOT a result due to damage to the cerebellum?
a) nystagmus
b) incoordination of speech (apraxia)
c) incoordination of limbs and gait (ataxia)
d) memory loss
d) memory loss (memory is temporal lobe)
(T/F) Anisocoria is never cause by an AFFERENT lesion.
true [Anisocoria is efferent (motor), it is the effect you observe as the output (efferent)]
Which pupil function is stronger: meiosis in light or meiosis at near?
meiosis at near (near fibers to light fibers are 30:1)…this also means that there is a higher likelyhood of damage to light fibers since there are not as many
A pt’s pupils constrict when converging but cannot constrict in light. What is this called?
Light-near dissociation
(T/F) You can neutralize an APD using neutral density filters.
true
