Earlier this week I visited an opthalmologist for a long overdue eye exam. Among other things, the doctor took an Optomap of my eye—basically a laser image of my retina—to see if there was anything to watch out for back there. She matter-of-factly gave me a 50/50 chance of suffering a retinal detachment in the future… something for me to look forward to.
But this visit, together with some questions on optics and vision asked by my AP Physics students last week, reminded me of just how incredibly intricate our vision is, from the way the placement of our eyeballs gives us stereoscopic vision, to the manner in which our brain interprets and reverses the images so that we see right side up.
An “Inverted” Retina
But in contrast to our intuitive recognition of its wonders, the human eye is often cited as an example of something that is sub-optimally designed, or so flawed that it could not have possibly been designed by an intelligent designer. Now, I know that my own eyes are certainly not optimal—just take a look at how thick my glasses are—but the argument is that even the most perfectly seeing eye is flawed, due to a critical “mistake” in the design of the human eye that can only be explained by an unintelligent evolutionary process rather than an intelligent designer.