Square-wave jerks

What it means

Square wave jerks are saccadic eye movements which, when recorded with open eyes are considered to be a pathological sign, caused by fixation instability, and pointing to a central neurological lesion.

Rare diseases that can present with this4

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category