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  • Diagnostic ophthalmic devices designed to elicit and evaluate the regular, involuntary movement of the eyeball (i.e., nystagmus). The devices are typically drum-like cylinders covered with uniform white and dark vertical stripes with a handle. The rotation of the devices can induce optokinetic nystagmus, and then the examiner observes the patient\'s abnormal eye responses. Optokinetic drums are used to diagnose a variety of visual problems.
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