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[Optokynetic and ocular dysmetria tests in the diagnosis of atypical internuclear ophthalmoplegia (author's transl)].

In a patient with atypical bilateral internuclear ophthalmoplegia the optokynetic test and the ocular dysmetria test detected an infraclinical bilateral lag of adduction. The optokinetic test showed amplitude asymmetry of nystagmus, which was larger in both eyes when the fast phase was in abduction. The ocular dysmetria test showed in both eyes that saccades were slower in adducting than abducting saccades: the latters overshooted and showed transient nystagmus. Since bilateral internuclear ophthalmoplegia is often indicative of multiple sclerosis, these tests are particularly helpful in those patients who otherwise would require more complex diagnostic investigations.