Saccadic Intrusions with an Intersaccadic Interval

𝗢𝗿𝗶𝗴𝗶𝗻𝗮𝗹 𝗗𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻: Seen here are patients with saccadic intrusions that have preserved intersaccadic intervals. Although square wave jerks (SWJ) are present in everyone to some degree at times, when prominent or when they interfere with vision, neurodegenerative conditions should be considered, mainly those involving the posterior fossa (e.g., cerebellar degeneration, tumors) and the basal ganglia (e.g., progressive supranuclear palsy, Parkinson's disease). Macrosaccadic oscillations are technically not considered saccadic intrusions, but a result of saccadic hypermetria. Because they can have a similar appearance to square wave jerks, they are included here. 𝗡𝗲𝘂𝗿𝗼-𝗼𝗽𝗵𝘁𝗵𝗮𝗹𝗺𝗼𝗹𝗼𝗴𝘆 𝗮𝗻𝗱 𝗡𝗲𝘂𝗿𝗼-𝗼𝘁𝗼𝗹𝗼𝗴𝘆 𝗧𝗲𝘅𝘁𝗯𝗼𝗼𝗸 𝗟𝗲𝗴𝗲𝗻𝗱: Seen here are patients with saccadic intrusions that have intersaccadic intervals. When square wave jerks are prominent or when they interfere with visual fixation, neurodegenerative conditions should be considered, mainly those involving the posterior fossa (e.g., cerebellar degeneration, tumors) and the basal ganglia (e.g., progressive supranuclear palsy, Parkinson's disease). Macrosaccadic oscillations are often associated with significant saccadic hypermetria due to cerebellar pathology, which was true of the last patient in this video. https://collections.lib.utah.edu/ark:/87278/s6gr0mmz