Optic Nerve/ Neuro-ophthalmic Pathways/Blood Flow Flashcards
Classic triad of Horner’s
PAM!!! PAM!!!
1. Ptosis (small, affects Muller’s muscle)
2. Anhidrosis (lack of sweat on one side)
3. Miosis (pupil constriction)
Argyll Robertson pupil associated with what infectious disease?
Late-stage syphilis
Physiological anisocoria
- Anisocoria equal under dim and bright conditions
- no ptosis
- confirm stability by referring to previous photos of patient
Signs of pupil involving 3rd nerve palsy
Eye is down and out with dilated (blown out) pupil
Patient presents with diplopia, headache, eye is down and out with a blown out pupil, what is your A&P?
A. Pupil involving cranial nerve 3 palsy caused by aneurysm of the posterior communicating artery
P. Send to emergency room ASAP (EMERGENT!!!)
Congenital Horner’s syndrome signs
Iris heterochromia (affected eye will have lighter iris)
Characteristics of tilted disc syndrome
- Bilateral
- optic nerve enters at an oblique angle superiorly
- situs inversus
Signs of tilted disc syndrome (name at least 3)
1) Optic nerve oblique insertion
2) fundus ectasia
3) Situs inverses
4) Myopic
5) superior temporal VF defects that do not respect the midline
A&P for isolated damage to 3rd order neuron causing Horner’s
A. Horner syndrome
1. isolated damage of 3rd order neuron
Plan
1. No further investigation
Right homonymous hemianopia is associated with stroke on which side of the brain? And can cause hemiparesis on which side of the body?
Cerebrovascular accident on left side of brain and patient likely has hemiparesis on right side of their body
Pulfrich phenomenon
Pendulum is perceived as moving in a circular motion rather than laterally
* symptom of optic neuritis
Ocular manifestation of multiple sclerosis
Optic neuritis
Optic neuritis age demographic
18 to 45 years old
Uhthoff sign
Associated with MS
Symptoms worsen with increase in body temperature
True or false
Horner’s syndrome can be caused by internal carotid artery dissection
TRUE
* 3rd order neuron damage from internal carotid artery dissection can cause Horner’s syndrome
Patients suspected with Horner’s due to a pre-ganglionic lesion should be referred for what further testing?
- MRI of head and neck
- CT scan of thorax
- chest x-ray (check for pancoast tumor)
Parietal lobe lesion will produce what VF loss?
Inferior incongruous or congruous VF loss (quadrantanopia)
* pie on the floor (parents put you down lesion in parietal lobe)
Lesion in temporal lobe produces what VF loss?
Superior quadrant VF defect, incongruous and wedge shaped, can also be complete
* superior quadrantanopia = pie in the sky
Optic radiations traveling through the _________ lobe carry visual information from the superior retina
Parietal lobe
* VF loss will be opposite therefore superior retina damage will cause inferior VF loss
3rd order neuron irregularities can be caused by? (Name at least 3)
Cluster headaches
Otitis media
Masses in cavernous sinus
Internal artery dissections
Nasopharyngeal tumors
Pancoast tumor can cause which order neuron irregularity in Horner’s?
2nd order neuron lesion
What is the most common cause of pupil sparing isolated 3rd nerve palsy?
Microvascular disease secondary to HTN &/or diabetes
Blood supply to oculomotor nerve
Surface and pupillary fibers are supplied by pial blood vessels; internal fibers are supplied by the vasa nervorum
What are the common triggers of a classic migraine?
- stress
- coffee
- chocolate
- cheese
- prolonged periods without food
- bright lights
- alcohol
- severe fatigue
- birth control