See o. nystagmus. [opto- + G. kinesis, movement]
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op·to·ki·net·ic .äp-tō-kə-'net-ik, -kī- adj of, relating to, or involving movements of the eyes <\optokinetic nystagmus>
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op·to·ki·net·ic (op″to-kĭ-netґik) [opto- + kinetic] pertaining to movement of the eyes and of objects in the visual field, as in nystagmus.Medical dictionary. 2011.