Wow. I feel like a cliche, but after reading the link I realize that I have the same, and had just assumed that it was something that everyone else also experienced and so never questioned it.

For some reason I’m better at getting triangles to form. I’m also the same as you- no migraines or anything that’d I’d consider a negative symptom.

The other optical-related illusion that someones happens with me is that if I’m focusing on something, occasionally everything else may ‘dim’ and that object will ‘feel’ subjectively closer/zoomed in, but a couple blinks and everything goes back to normal.

Edit: I’ll also add that I consider myself to have a terrible visual imagination. If I try and imagine a face (even my parents) I basically don’t get anything. If I concentrate very hard I can imagine something basic - like the wireframe of a cube - but requires a lot of effort to maintain.