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Reflexive saccade of all participants. (a) A 31‐year‐old male healthy control showed perfect performance. Blackline is the target reference line, and the color line is the actual eye movement. (b) A 63‐year‐old female PD patient (H&Y1) showed hypometria. (c) A 56‐year‐old female MSA patient showed both hypometria and hypermetria. hypometria: solid arrow, hypermetria: dotted arrow
