Hello -
What you've described is, almost certainly, the "aura" that occurs with what's called optical migraine, wherein the aura is all that happens. This is often more disturbing, at least until it's understood, than having an excruciating
headache,as it seems more exotic. You've described the classic "blind spot" followed by scintilating scatoma (the irridescent crescent). These things last, in some people, up to an hour, and can be very distracting, but cause no other problems.
The change from Yasmin to Ocella is unlikely to have caused this. They don't happen, then one day they do. They can be one-time things, extremely rare, or frequent.
Birth control pills cause problems by making the user of them more likely to develop blood clots, which shouldn't have any bearing on the problem. However: one of the adverse side effects of Ocella/Yasmin is new-onset migraine
headache with focal neurologic symptoms. The reason this is considered a reason to stop the medication is because migraines can be so severe as to be disabling. Since you're only having optical migraine, this may not present an insurmountable problem for you, but you should, at least, report it to the prescribing nurse practitoner or another physician. It may be an indication that you'll need to switch to a different BCP.
I hope this answers your question. Please follow up here with us as needed. Best of luck to you.
