Yup. It’s like the fact that your eyes heck all over and I believe slightly vibrate in order to sample from slightly different positions to improve image quality.

Yeah, our eyesight is not very good without that saccade motion.

Below some movement threshold you go completely blind in just a few seconds.

One of the standard stare-at-the-dot-machine optometry tests is enough to make my vision start to gray out.

Yeah, your body adjusts to stimulus very quickly to minimize it.