Preason OR Has Science gone mad?

I know there is no such word as preason... But there is prison and there is reason... And by combining you can reach the status of some modern scientists. Let me explain my line of thinking!

I was reading the other day a respectable science book referring to vision and how art is perceived by the brain... The excerpt I am referring to goes more or less like this:

"But why do we need to see?"

The author after saying how some others might answer this question gives the following answer...

"We see in order to have the ability to acquire knowledge about the world".

And why do I feel offended by such an explanation? Why do I think reason is a prison when trying to expain the inexplicable?

The truth is I find it hard to believe that any human could possible have the answer of "why do we need to see". Maybe I would listen to somebody offering an explanation like that if he/she said that he had contact with more intelligent extra terrestrials or has been "channelling" entities from another plane of existence and that's what they told him... But how unfortunate it is to try to explain the mystery of our world by mere logic and reason. How god-like to offer explanations about things we know nothing about. How can we now the "reason" just by knowing the results? We can say that vision is guided by the brain or anything but how can this be in any way connected to "why" we see?

I could go on and on about this but the important thing is that "reason" is not a panacea. It doesn't hold the keys to every door. It holds the key however to the golden door of its own self-defeat.