Ocular-motor Disorders Flashcards Preview

Ophthalmology > Ocular-motor Disorders > Flashcards

Flashcards in Ocular-motor Disorders Deck (21):
1

Phoria

Indicates weakness of a muscle
If eye is not focused on something, it drifts.

2

Tropia

Indicates paralysis of the muscle.
Eye drifts even when focusing on a target

3

Eso

Eye is deviated inward
Esophoria, esotropia

4

Exo

Eye is deviated outward
Exophoria, exotropia

5

Hyper

Eye is deviated upward
Hyperphoria, hypertropia

6

Hypo

Eye is deviated downward
Hypophoria, Hypotropia

7

Which CN constricts the pupil? Sympathetic or parasympathetic?

Parasympathetic fibers of CN III. They supply the ciliary body and sphincter of iris.

8

Acquired CN III palsy

- Sudden onset of binocular horizontal, vertical or oblique diploplia.
- Ptosis or droopy eyelid.

9

Congenital CN III Palsy

- Found in young children
- May be able to suppress the second image in diploplia, may not complain.
- Ptosis and strabismus
- Amblyopia is major complication

10

Complete CN III palsy is usually associated with a large angle _____ and _____?

Exotropia and hypotropia. Down and out.

11

CN III palsy differential

- HTN, diabetes
- Tumor
- Congenital
- Aneurism

12

CN III Palsy Tx

- Neuroimaging
- Consult a neuroradiologist
- Tx is directed at underlying etiology
- Maximize function

13

CN IV

Trochlear nerve
Has longest intracranial course
Only nerve with a dorsal exit from the brainstem
Innervates Superior Oblique (SO4)

14

CN IV Palsy

- Binocular vertical diploplia/subjective tilting of objects
- Neck pain

15

What is nasal upshoot?

Ipsilateral Hypertropia. Eye is deviated upward .

16

CN IV Palsy causes greater hypertropia in _____ gaze.

Left

17

CN IV Palsy Tx

Neuroimaging
LP if negative imaging
Treat underlying etiology

18

CN VI

Abducens Nerve
Enters orbit via the superior orbital fissure
Innervates Lateral rectus (LR6)

19

CN VI Palsy

- Binocular horizontal diploplia that worsens with gaze toward defective lateral rectus muscle.
- Strabismus toward paralyzed side.

20

CN VI Palsy Presentation

- Primary position esotropia
- Eye is turned in (crossed eye)

21

When is CN VI palsy an emergency?

When focal signs or papilledema are present
-Increased ICP