I have seen things out of the corner of my eye, but only in mania & when I was running on virtually no sleep for a few months in a row. During that time I thought I saw someone behind me, turned around & no one there, more than once. I also thought I heard my name called a few times. Part of me thought maybe it was a guardian angel - delusional thinking?

I don't think out of the corner of your eye is too alarming or abnormal but worth mentioning to your Pdoc if it gets more prominent.