Sensei Nishiyama used to repeat “eye, face guiding (the) body (when changing direction), Eyes, face setting the body at kime, when eye(s) stop this is kime”, “kime is from eye” or “at kime nothing moves, even eye(s) don’t blink”.
We all know that at kime we make pressure to floor and sharp total body contraction, but we cannot forget that in a sense kime is from eyes.
If eyes are blinking at kime, coordination between breathing and muscle action is lacking, also if eyes moving at kime intention cannot be strong, and the stronger the intention the more the muscles can cooperate to one direction.