This reminds me of something I've seen quite a few times. I've almost been blind for some periods of time. I notice it happens if there's a highly contrasted bright light I see and it appears to trigger something in the eyes that I believe is a reorganizing of the visual nerves. It slowly spreads out and though it appears just to be a general "sparkling" in the blind spot area that spreads and grows outward, I've actually noticed very fine zig zags that appear to even have something close to a detailed binary sequence almost like a binary count and these appear to "reflect" off the edge of the blind spot.
It may be that this type of shape is some low level manner of visual processing? I assumed it was the nervous system attempting to adjust for seeing a strong contrast and possibly assuming there was a problem in vision and sort of reorganizing.
Something else I noticed is that it occurs in both eyes, and so it's a process coordinated non-local to the optical nerves and would likely be part of the area in which 3-D vision from both eyes is integrated.


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