convergent 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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convergent strabismus

n.

See esotropia.

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convergent squint, convergent strabismus.

See esotropia.

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convergent strabismus (kn·verˑ·jnt str·bizˑ·ms),

n condition in which the eyes turn inward toward the nose; cross-eyed.

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strabismus

deviation of the eye that the patient cannot overcome; the visual axes assume a position relative to each other different from that required by the physiological conditions. Called also squint.

Basic types of strabismus. By permission from Guyton R, Hall JE, Textbook of Medical Physiology, Saunders, 2000

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comitant strabismus

extraocular muscles are not paralyzed and the degree of deviation is the same in all directions.

congenital strabismus

medial strabismus is seen in Siamese cats. See convergent strabismus (below).

convergent strabismus

that in which the visual axes converge; esotropia, or cross-eye. A frequent finding in Siamese cats, related to an anomaly of neuronal pathways between the retina and lateral geniculate nucleus in which more neurons project contralaterally rather than ipsilaterally as in other cats.

divergent strabismus

that in which the visual axes diverge; called also exotropia and walleye.

inherited strabismus

see inherited exophthalmos.

noncomitant strabismus

deviation due to paralysis of one or more muscles.

traumatic strabismus

a complication of traumatic prolapse of the eye, due to rupture of extraocular muscles.