vertical strabismus

strabismus /stra·bis·mus/ (strah-biz´mus) squint; deviation of the eye which the patient cannot overcome; the visual axes assume a position relative to each other different from that required by the physiological conditions.strabis´mic

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concomitant strabismus  that due to faulty insertion of the eye muscles, resulting in the same amount of deviation regardless of the direction of the gaze.

convergent strabismus  esotropia.

divergent strabismus  exotropia.

nonconcomitant strabismus  that in which the amount of deviation of the squinting eye varies according to the direction of gaze.

vertical strabismus  that in which the visual axis of the squinting eye deviates in the vertical plane (hypertropia or hypotropia).

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vertical strabismus

n.

Strabismus in which the visual axis of one eye deviates upward or downward.

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vertical strabismus

Etymology: L, vertex + Gk, strabismos, squint

a deviation of one eye in a vertical direction from a point of fixation. A common cause is overaction by the inferior oblique muscles or a weakness of the superior oblique muscle, resulting in a quick vertical movement of the eyeball on adduction. Also called upward-and-downward squint, vertical squint.