In Japanese swordmanship, it is suggested that one should use āenzan no metsukeā, (as if looking at distant mountains) when looking at a potential enemy, thus encompassing the whole. This is because the peripheral retina is
very good at detecting
movement and once that movement has been registered, itās connections to the superior colliculus (in the tectum of the midbrain) will reflexly swing the eyes around to foveate the are that is moving for full-resolution vision!
Have you ever been lying on you sofa, in the cooling autumn and almost subconsciously, noticed scuttling in the periphery of ones vision, then directly seen it to be a spider, leap up at lightning speed and scream like a little girl?
That is ones superior colliculus in action and itās very quick!
Iāveā¦ahemā¦never done that
(copied over from a very similar thread)