10 - Opth - Squints - Incomitant Squints Flashcards Preview

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Flashcards in 10 - Opth - Squints - Incomitant Squints Deck (8):
1

usually due to? can be due to?

CN palsies
occasionally myopathies (usualy bilateral)

2

What would eye with a CNIII palsy look like + why?

only LR and SO spared, therefore,
eye looks down and out

complete ptosis (levator paralysis)

efferent pupillary defect (fixed dilated pupil)

3

What would eye with a CNIV palsy look like and why?

SO affected
eye looks upwards at rest/adduction

pt may complain of tilted image

unable to look down and in (diplopia on looking down)

4

what would eye with a CNVI palsy look like and why?

LR affected
unable to abduct affected eye
eye may drift medially (esotropia)

5

5 causes of neurogenic palsies - think surgical sieve

vascular - eg microvascular - likely cause if pupil sparing CNIII lesion
trauma - head injury
tumour - esp suspect in kids
inflammatory - eg post viral
infection - middle ear with VI palsy, HZoster Opthalmicus

6

Mechanical causes of incomitant squint

blow out fractures
thyroid eye disease

7

Myogenic causes of incomitant squint

Myasthenia Gravis
Tumour/inflammation of EOMuscles

8

Mgmt of diplopia in incomitant squints

Prisms on glasses (combo images)
Occlusion (patch - temp/perm solution)
Surgery - if stable diplopia, aim to treat for primary (ahead) and depressed (reading) vision

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