Strabismus - Fundamentals of Clinical Ophthalmology.pdf

STRABISMUS
Strabismus Malalignment of the eyes owing to
a breakdown or failure of development of
binocular single vision at a particular test
distance or in a particular direction of gaze.
Incomitant strabismus is where the angle of
misalignment of a strabismus, measured at a
particular test distance, varies depending on the
direction of gaze. Concomitant strabismus is where
with the accommodation controlled, the angle of
misalignment of the strabismus when examined
at a particular test distance will remain constant
regardless of the direction of gaze.
Vergence movement A disjunctive movement.
Both eyes move in opposite directions to keep
object of regard focused on each fovea
simultaneously.
Vestibular mechanism Where the image of the
object of regard is held on the retina during brief
head rotation.
Visual fixation With the head stationary, visual
fixation is the act of focusing a stationary object
of regard upon the fovea.
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