Top-down control mechanisms exist for vision, including blinking, eye movements, and focusing the lens.

“Um, you know, we talked about the top down control over the ear, but there's a lot of top- down control over vision, too. And some of it is a little easier to understand than what I just described because blinking is top- down control over vision. Uh, eye movements, top down control over vision. Focusing the lens of your eye, right? That's also top down control.”