FN: Strabismus/Squint/Tropia Flashcards Preview

Final Notes > FN: Strabismus/Squint/Tropia > Flashcards

Flashcards in FN: Strabismus/Squint/Tropia Deck (13):
1

Esotropia =

Convergent squint
- commonest type in children
- may be idiopathic or due to hypermetropia

2

Exotropia

Divergent squint
- Older children
- Often intermittent

3

Non-paralytic squint diagnosis

Corneal reflection: should fall centrally and symmetrically on each cornea
Cover test: movement of uncovered eye to take up fixation demonstrates manifest squint.

4

Non-paralytic squint Mx

3 O's
- Optical: correct refractive errors
- Orthoptic: patching good eye encourages use of squinting eye
- Operations e.g. resection and recession of rectus muscles - help alignment and cosmesis

5

Paralytic squint

Diplopia is most on looking in direction of pull of paralysed muscle.
Eye wont fixate on covering
Cover each eye in turn: which ever eye sees the outer image is malfunctioning

6

Paralytic squint CNIII

- Ptosis (LPS)
- Fixed dilated pupil (no parasympathetic)
- Eye looking down and out

7

Paralytic squint CNIII causes

Medical: DM, MSm infarction
Surgical: Raised ICP, cavernous sinus thrombosis, posterior communicating artery aneurysm

8

Paralytic squint CNIV

- Diplopia espcially on going down stairs
- Head tilt

9

Paralytic squint CNIV test

Cant depress in adduction

10

Paralytic squint CNIV causes

Peripheral: DM (30%), trauma (30%), compression
Central: MS, vascular, SOL

11

Paralytic squint CNVI

eye is medially deviated and cannot adduct
Diplopia in the horizontal plane

12

Paralytic squint CNVI causes

peripheral: DM, compression, trauma
Central: MS, vascular, SOL

13

Paralytic squint CNVI Rx

Botulinum toxin can eliminate need for surgery

Decks in Final Notes Class (196):