Neuro Ophtha 1

What is the correct description of latent nystagmus?

• Under moncular conditions, bilateral jerk nystagmus occurs with fast phase beating towards viewing eye

• Under moncular conditions, bilateral jerk nystagmus occurs with fast phase beating towards occluded eye

• Under moncular conditions, there is unilateral jerk nystagmus of viewing eye with fast phase beating towards viewing eye

• Under moncular conditions, there is unilateral jerk nystagmus of viewing eye with fast phase beating towards occluded eye

Answer explanation

LN - nystagmus that develops early in life

A bilateral jerk nystagmus that generally manifests upon occlusion of 1 eye. Fast phase beats toward the viewing eye.

What percentage of the population has physiologic anisocoria noticeable on penlight exam?

• 1%

• 5%

• 10%

• 20%

Answer explanation

Physiologic anisocoria - less than 1.0mm difference in pupillary diameter between both eyes; usually same in light and dark conditions

Based on the Optic Neuritis Treatment Trial (ONTT), what percentage of eyes affected by demyelinating optic neuritis demonstrate optic disc edema?

• 35%

• 55%

• 75%

• 95%

Answer explanation

ONTT:

35% of demyelinating optic neuritis optic nerves were edematous

65% were normal appearing

How long after injury to retinal ganglion cells or their axons does it take for optic nerve atrophy to appear?

• 1-2 days

• 1-2 weeks

• 4-6 weeks

• 10-12 weeks

Answer explanation

This fact simply needs to be memorized :)

What is the eponym for idiopathic sterile inflammation of the cavernous sinus?

• Wallenberg syndrome

• Heimann-Bielchowsky phenomenon

• Miller-Fisher syndrome

• Tolosa-Hunt syndrome

Answer explanation

Wallenberg - lateral medullary syndrome

Heimann-Bielchowsky - monocular vertical pendular nystagmus w/c occurs in poorly seeing eye

Miller-Fisher - an oculomotor predominant variant of Guillain Barre syndrome wherein EOMs are affected first

Tolosa-Hunt - sterile inflammation of cavernous sinus marked by ipsilateral periorbital pain w/ deficits of any or all nerves passing through cavernous sinus (CN 3,4,V1,V2,6 and all sympathetics)