I think you're delving into semantics. Christians define God as Love as in "God is Love". Does love exist?
These questions wouldn't exist without humans. Right?
For those interested: This was published 2 months ago http://adsabs.harvard.edu/abs/2010PhRvL.104o8102L
It seems the human eye wasn't an 'evolutionary flaw' after all as some proclaimed. Quote: "The retina is revealed as an optimal structure designed for improving the sharpness of images."
Basically: The blood vessels can act as wave guides for the incoming light. Cool!
Ultimately, there is no Truth, just levels of certainty
Take an astronaut to launch.