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
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