“In a curious twist of logic,evolutionists often argue that if…
“In a curious twist of logic,evolutionists often argue that if in their opinion, some organ or tissue in our body is “poorly designed” this reveals that there is no design or designer at all.
A favorite “poor design” among such folks is the inverted, or “upside down” retina found in all vertebrates.
The assumption is that if only vertebrates had properly designed eyes, we would see a lot better. In any event, it is now evolutionary dogma that no designer would have designed the inverted vertebrate retina.
Like “junk DNA” we would expect “junk retinas” from mindless and purposeless evolution but not from a competent designer.
It is true that no designer would position the retina of all vertebrates “upside down” with its photoreceptor cells facing away from the incoming light, unless there were good reasons for doing so – and there are!
This arrangement positions the metabolically demanding photoreceptors in contact with the rich blood supply in the choroid layer behind the retina.
You would not want this essentially opaque layer in front of the retina.
This means, however, that the photons of light coming into the eye must pass through layers of nerve fiber tracts as well as amacrine and glial cells to get to the photo receptor cells.
This would be a huge problem except for the Mueller cells that extend through the whole thickness of retina, and these cells are – wait for it – living fiber optics! Problem solved.”
– Dr David Menton