If any evolutionist ever tries to tell you that the inverted (backwards) retina is evidence of evolution’s trial-and-error poor design and evidence against God being a good Designer, just tell them that you can’t argue with success.
All vertebrates (things that have a backbone) have inverted retinae
That includes the eagle, which can see a fish underwater in a pond a mile away.
Your own eye can register 6 quanta of light. That’s like a candle 14 miles away on a perfectly clear and dark night (at the extreme human ability that is).
Invertebrates have non-inverted retinae, but an octopus or a snail just cannot see as well as the creatures with the inverted retinae.
If it’s such a poor design, then why does it work so well?!
The inversion has a great advantage in handling the heat caused by harsh sunlight from focusing through our lens and damaging our retina. And why did God give mollusks such bad eyes? For an octopus or a snail, well they tend to stay out of harsh sunlight either in the shade or under the water. ~Dr. J