EOMS
Axis of rotation is --------- to movement of direction - ANS-perpendicular
● Horizontal movement has a _________________axis
● Vertical movement is about a _____________ axis - ANS-Vertical, Horizontal
Torsional movement is about the ________- - ANS-line of sight (LoS)
There is visual consequence of torsional movement in the _____ not on the fovea -
ANS-periphery
Convergence is positive because vergence is calculated as left eye minus right eye -
ANS-■ right eye looks leftwards → negative movement
■ Left eye looks rightwards → positive movement
■ (+) left - (-) right = (+)
Convergence = Left eye - right eye
Vertical recti are ___________ to the visual axis in each eye - ANS-23 degrees
temporal
Superior rectus
Obliques are ___degrees nasal to the visual axis in each eye - ANS-51 (SO)
If the eye turns out away from the nose (abducted), by 23 degrees: - ANS-○ Obliques
have more torsional action
○ Vertical recti have more vertical action
If the eye is turned toward the nose (adducted), by 51 degrees: - ANS-○ Obliques have
more vertical action
○ Recti have more torsional action
iF THE eye is aligned on the axis of the muscle we purely get - ANS-vertical movement
If the eye is orthogonally-aligned (think perpendicular) along the axis of the muscle we
get --------- - ANS-torsional movement
When OS is abducted at 23deg and LSR contracts → you get - ANS-only vertical
motion (no torsional component)
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