Opthalmic migraine
Fluttering zigzag snake, glittering flashes of mostly white, bright but not blinding, obscuring everything. The snake writhes across my field of vision, uncoiling towards the sides. Diamond-studded cobra, glistening in the light it creates. A sense of numbness, disorientation but not fall down sick. Lasts about half an hour, start to finish, and I would never drive during one.