@timhutton
"If it isn't a small circle, let us know."
My typical computing is done over VNC, which didn't seem to provide the timing or resolution for the fovea shader to work. I finally got the hi-res version downloaded from YouTube to loop on my 12.9" iPad...
My vision is horrible, I have to get really close to the screen to see the tiny shapes rotate. Once they are clear enough, I'd say the angle of view that is rotating is around 20 degrees - more than the macula, and way more than the fovea, even when some sites say it is 5 degrees instead of 2 or 1 degree.
I'm sure my situation is rare and irrelevant, but I'm curious if there is some structural boundary in my eyes that creates this wide angle.
In daily life I'm quite aware that I depend on my dorsal stream and body movement for details of my world. Flat images are hard to resolve.