I understand your concern and I am sorry for your symptoms.
This I feel could be Ocular migraine.
Migraine headaches may be preceded by a visual "aura", lasting for 5 to 30 minutes (most commonly around 15 minutes), and then proceeding to the headache. Some people, however, experience the aura but do not have a headache. This visual aura can be very dramatic. Classically, a small blind spot appears in the central vision with a shimmering, zig-zag flicker light inside of it ("scintillating scotoma"). This enlarges, and moves to one side or the other of the vision, over the 5 to 30 minute period. When it is large, this crescent shaped blind spot containing this brightly flashing light can be difficult to ignore, and some people fear that they are having a stroke.
In reality, it is generally a harmless phenomenon (with one exception noted below), although many people subsequently get the migraine headache.
Since migraine originates in the brain, the visual effect typically involves the same side of vision in each eye, although it may seem more prominent in one eye or the other. It is usually mainly perceived as occurring in the eye in which is occupies the temporal (outside) field of vision. The visual phenomenon would also be perceived in the nasal field of vision of the other eye.
Some people get different variations of this phenomenon, with the central vision being involved, or with the visual effect similar to "heat rising off of a car". Some people describe a "kaleidoscope" effect, with pieces of the vision being missing. All of these variations are consistent with ophthalmic migraine. There are many examples of "visual migraine" that have been drawn by patients available on the internet.
Please note that this is different from a condition known as "retinal migraine". A retinal migraine is a spasm of the artery entering the eye and leads to a temporary near-total loss of vision (a black out of the vision). This is different from "visual migraine", which originates from the brain and is perceived bilaterally in the vision.
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