Thank you for teaching me something new! I used to get these more frequently but just had one last week for the first time in ages. Mine look quite a bit like [0] and I never knew what they were or that they had a name.

Mine used to happen a bit when playing sport so I always associated them with dehydration, but it seems like that’s probably not it.

[0] https://commons.wikimedia.org/wiki/File:Scintillating_zigzag...