I wonder why the eyes had to develop a method to defeat adaptation from the brain. A quick google search yielded no answers, but if I had to guess, neural adapt

I wonder why the eyes had to develop a method to defeat adaptation from the brain. A quick google search yielded no answers, but if I had to guess, neural adaptation developed first in simple nervous systems because it helped organisms react to changes, such as a changing water current when a predator was nearby. As complex vision developed, it became advantageous for organisms to not go blind momentarily for some reason, perhaps because changes in the environment can be better predicted with constant sight. Organisms that didn't go blind had an advantage, and the method for them not to go blind was for their eyes to jiggle imperceptibly but just enough for the brain not to adapt. That would be my guess anyway. Detecting only changes works better for "simpler" senses like touch, but sight works better when it's not arbitrarily turned off by the brain.