Is this the same thing as “Occular Migrane” I have these crescent shape images obsuring my vision that kind of quiver and have zig zag patterns. Happens about every 2 months and last 5-20 minutes. I heard them called “Occular Migranes” My eye doctor had not heard of this, but it seems to describe the problem. It is not really an eye problem, but a vascular problem i believe. Pretty benighn. No pain, but anoying when it happens. I think they occur when i have higher sinus pressure. But that happens a lot so maybe i just want to blame the sinuses.