Neurology/Neurosurgery - Diplopia Flashcards Preview

4MB Medical Specialities > Neurology/Neurosurgery - Diplopia > Flashcards

Flashcards in Neurology/Neurosurgery - Diplopia Deck (9)
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1
Q

What is the difference between monocular and binocular diplopia?

A

Binocular disappears when you cover one eye

Monocular does not.

2
Q

Where is the likely cause of monocular diplopia?

A

Usually, it will be a problem with the eye itself and not with convergence

3
Q

What is usually the cause of binocular diplopia?

A

Usually, it will be a problem with convergence of the left and right eye and a misalignment.

4
Q

What are the reasons your eyes might not converge?

A

Eyes move due to muscles, under control of the nerves.

Therefore problem may be due to muscle problems or may be due to nerve problems

5
Q

What muscle(s) are controlled by the abducens nerve?

A

LR6 - lateral rectus - abducts eye

6
Q

What muscle(s) are controlled by the trochlear nerve?

A

SO4 - Superior oblique. Abducts, depresses and internally rotates the eye - (?change this based on rachel’s answer!)

7
Q

What muscle(s) are controlled by the oculomotor nerve?

A

AO3 - all others 3.

  • medial rectus - adducts eye
  • inferior rectus - depresses eye
  • superior rectus - elevates eye
  • inferior oblique - abducts, elevates and externally rotates eye
  • levator palpaebrae superioris - elevates eyelid
  • Sphincter pupillae - constricts pupil (parasympathetic innervation)
8
Q

What would be seen in an abducens palsy then?

A

Failure to abduct the affected eye. Diplopia maximum in lateral gaze on affected side. Causes an esotropia.

9
Q

Which nerve(s) are most susceptible to a raised ICP?

A

Abducens - 6th nerve palsy may be an early sign of raised ICP/idiopathic intracranial hypertension.