Blindsight

Blindsight is a thing that can happen when someone has a medical condition called "blindness." When someone is blind, it means they can't see things with their eyes. But with blindsight, even though someone can't see, their brain can still help them do things like avoid objects in their way or reach out and grab things without seeing them. It's like their brain can "see" things even though they can't see them with their eyes.