Mean acceleration trajectory (solid line) and the corresponding SD (dashed lines) of all control subjects (black lines) and patients (red lines) when they reached to the 10° target with (a–c) or without (d–f) visual feedback of the target. Viewing was binocular (a, d), monocular with the fellow eye (b, e), or monocular with the amblyopic eye (c, f). In all three viewing conditions, patients had lower mean peak acceleration and prolonged duration of the acceleration phase (indicated by the delayed zero-crossing) than did control subjects.