EOM Versions & Cover Test
Version - ANS-a binocular movement or rotation of the eyes in the same direction
Vergence - ANS-a binocular movement of the eyes in the opposite direction
Duction - ANS-monocular rotation
Primary Field of Gaze - ANS-Eyes looking straight ahead, all muscles innervated
equally
Cardinal fields of gaze - ANS-Secondary positions
There are 6 total
Direction of gaze in which one EOM for each eye is in full action or in its primary field of
action (primarily responsible for that eye's movement to that position)
EOM at cardinal position: eyes up right - ANS-Right superior rectus
Left inferior oblique
EOM at cardinal position: eyes up left - ANS-Right inferior oblique
Left superior rectus
EOM at cardinal position: eyes right - ANS-Right lateral rectus
Left medial rectus
EOM at cardinal position: eyes left - ANS-Right medial rectus
Left lateral rectus
EOM at cardinal position: eyes down right - ANS-Right inferior rectus
Left superior oblique
EOM at cardinal position: eyes down left - ANS-Right superior oblique
Left inferior rectus
Three ways to conduct versions - ANS-single H pattern
rotations
double H pattern
Setup for Double H EOMs - ANS-Rx off
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