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OptoDrum is an easy to use replacement for a bulky optokinetic drum or a fraying cloth tape to elicit optokinetic nystagmus, OPK or OKN, for evaluation of neurological, otological, and opthalmological disorders. Simply place the iPhone with a moving pattern in front of a patient’s eye to elicit the response. The stripe pattern, width, and speed are easily adjustable.• OptoDrum provides five patterns: black stripes, red stripes, mixed colors, symbols, and animals.• Drag a finger up or down the screen to make the pattern move at the speed of your finger.• Double tap the moving pattern to make it stop.• Pinch or zoom the pattern with two fingers to narrow or widen the stripes or symbols.• A left or right finger swipe switches a stopped pattern to the next one in rotation.

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