Clinical Evaluation of EOMs
Ductions - ANS-monocular eye movements
-one of the best ways to check diagnostic action field of each EOM
-observe integrity of EOMs involving fixation
-if one eye is covered, fellow eye is still moving with open eye in yoked eye movement
Ficke's Axes - ANS-Fick proposed 3 axes which all intersected at the center of rotation
of the eye.
The x axis
-a horizontal section (from medial canthus to lateral canthus), that extends through the
center of rotation.
Y axis
-sagittal line from the anterior pole of the globe to the posterior pole to the globe,
remember that the posterior pole does not include the fovea or optic disc.
z line is a coronal line, passing through the center of rotation of the globe from superior
to inferior.
-eyes are rotating to compensate, which is keeping things horizontal. This rotation is
important for binocular vision being maintained.
Adduction - ANS-Rotation around z axis medially towards the nose
ABduction - ANS-Rotation around z axis laterally towards the ears
Elevation (Supraduction) - ANS-Rotation around horizontal x axis moving the anterior
pole up
Depression (Infraduction) - ANS-Rotation around horizontal x axis moving the anterior
pole down
Torsions/Cyclotorsions - ANS--Rotations around the Y axis
-Work like a corkscrew on a cork
-Referenced to 12 o'clock position on the superior limbus
-Nasal rotation of that 12:00 landmark is intorsion (incyclotorsion) SR
-Temporal rotation of that 12:00 landmark is extorsion (excyclotorsion)
Versions - ANS--Conjugate eye movements
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Hkane. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.39. You're not tied to anything after your purchase.
