Why we Care about Blinking
Yes, it seems like an dull subject, but blinking is important for many creatures so they can keep their vision. People who have dry eye syndrome need treatment. Although blinking is not a conscious activity, it can be controlled for a short time.
In "Mudskippers Blink, Evolution Tinkers," we considered how Darwin's disciples study the mudskipper for evidence of evolution, assuming it is evolution in action and that life evolved in the sea — then things decided to evolve further on land. Yet there is no evidence for mudskipper evolution.
Blink and smile, Flickr / Lee Haywood (CC BY-SA 2.0) |
Biologically, we blink to moisten the eye, but not according to purely mechanically predictable intervals between blinks. Instead it varies, depending on the humidity, wind, and other physical factors. The thin-film fluid layer on the surface of the cornea allows the transfer of oxygen from the air to the corneal epithelium, which is not vascularized. For this reason, the blinking system is critical for eyesight. Without it, blindness would result.. . .The complexity of blinking, which involves the brain, the nervous system and several muscles, indicates that something could go wrong, producing pathology.[5] In general, the more complex a structure, the more that will go wrong. Furthermore, the more complex a structure in general, the more difficult it is to explain by evolution.
To eyeball the entire article, visit "Blinking is a Big Problem for Evolution."