Infranuclear disorders of ocular motility are caused by neurogenic, synaptogenic, or myogenic pareses. With the exception of dystrophic myopathies, only one eye is usually involved at a time, or the problem is very asymmetric, such that even a mildly reduced strength of the paretic muscle results in strabismus. More severe levels of paresis are marked by a limited range of motion and/or reduced amplitudes or velocities of saccadic movement. The angle of the deviation is variable. It increases with movement into the field of action of the paretic muscle, and decreases with movement into the field of action of its antagonist.
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