Question

Why can't we walk in a straight line after closing our eyes?I need the scientific explanation.

Answer 1

after closing our eyes.. there is no reception of data through eye to our brain. so brain starts to guess the path.

Answer 2

We know this eyes is one of most important sense of our body.When we brain with the help of visuals calculate that which path is straight and which is not and secondly we got a habit of this.Without eyes sense
brain can't  find out the actual direction of the body.And that is a person can't walk straight.