People who favor Intelligent Design will point to the eyeball as a marvel of irreducible complexity. The system for sight – biomechanics, function and linkage of the eye to the brain – is so complicated that there is no way for small-change evolution to end up with an eyeball; each piece is dependent on all the others.
People use their eyes to communicate in marvelous ways. They Wink (see the movie I, Robot). They Blink (see the Doctor Who episode by that name). They Roll (see any teen movie). They Cross (don’t try this at home; if someone hits you in the back while your eyes are crossed, they will stay that way). They Vibrate (Jesse does this to freak me out – his eyes jiggle rapidly back and forth).
My most unique eye activity was during my hospital stay with Guillian-Barré syndrome. My eyes could blunk out. This is the phrase used in the Pogo comic strips to lampoon fellow comic Little Arf and Nonnie (Little Orphan Annie), whose characters famously had no pupils in their drawn eyes.
My face, like the rest of my body, was mostly paralyzed. I couldn’t hold my lips together to use a straw, I couldn’t move my eyebrows, and I couldn’t completely draw my eye lids together. They tell me that when I thought I was closing my eyes I was really rolling them back into my head to duck under the bit of lid that came down. Weird.
I would sleep with my eyes blunked out, on my back, and appear to be awake. It made for some awkward moments. My friend Kirk came in one afternoon and had a long one-sided discussion with me until the guy in the neighboring bed said, “he doesn’t look like it but he’s asleep.” Sorry, Kirk. Glad you stopped by.