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Dear Chris Ayala, Regarding your inquiry as to how dyskinesia can be impacted by vision consider the following. Dyskinetic gait can be controlled by acceleratin= g optical flow. For example see what happens when walking on a moving sidewalk as found at many airports. Or simply try running. Or try monitoring the world through a video camera with image stabilization technology. Or try riding a bicycle. Avoid seeing the apparent motion o= f objects which accelerate and decelerate such as swinging arms (put them behind your back) and your feet - screen them from view. Try and focus o= n things which move with the head (head tracking) because the head moves through the world with constant velocity. This can be done by extending the arms and hyperextending the hands so that one looks at one's fingernails as one walks. Note also how dyskinesia is suppressed while performing an overlearned motor package (such as a tennis serve or a throwing a baseball)if those activities happen to be part of your overlearned repetoire. Or try walking over visual cues such as an array = of cards at stride length intervals on the floor. = For non weightbearing dyskinesia (the squirming around in the chair type)try wiggling a finger at the extreme periphery of the eye where you can only see the motion of the wiggle and not the finger iteself. Or try= blue filters (look up past references to blue filters in the PD archives.= This is only some of the ways in which vision and dyskinesia are inter related. Any questions? Regards, = Tom