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i dont know if that can be stated definitively given the sheer breadth of documented effects ... copied from wikipedia :
I've dealt with severe migraine conditions (both classic headaches and the so-called 'painless' / 'silent' variety) for over 40 years. The centering in the visual field, correlation with movement, and absence of other visual disturbances essentially rule out a migraine effect. There's still the possibility the drip effect could be the result of a migraine-like neural glitch triggered by (e.g.) a blood pressure fluctuation, but I see this as far less likely than an ocular issue.