There is a blind spot in the center of our vision where the optic nerve comes through to spread over the retina.
Another way to "see" the effect you notice is with the stars. When you look directly at a star it will disappear because it's over the blind spot on the retina.
Or, maybe the LED you noticed is large enough to surround this blind spot and something else is going on.
DatsunL6 t1_j78wgh4 wrote
Reply to comment by Prestigious_Carpet29 in Does the central part of my vision see in a different frame rate than the outer part? by Calvinkelly
That's right. Dimmer stars disappear when directly looked at and it's not to do with the blind spot.