Why do both eyes blink at the same time?


Wouldn’t it make sense to have partial vision all the time instead of a momentary black-out?

In: Biology

When you use two eyes, your brain is stitching together information from two sources, pretty flawlessly, to give you a sense of depth perception. There is a lot of overlap in what each eye sees, and your brain needs to sort out how it all makes sense.

Blinking with one eye at a time (winking), would mean disrupting that balance, and your brain would need to adjust. In addition, you’d actually be spending longer with imperfect vision. Say, one eye closed for 2 seconds a minute compared to two eyes closed for one second. I’m guessing this trade-off wasn’t worth it biologically.

If you’re my yorkie you blink the left and then.. eventually.. the right. And that’s just one of the many ways we know she’s a slice short of a pie.

I have this, when I want to blink with my left eye- I can do it. But with my right eye, I have a lot of trouble – I have to close it with my hand first so that I could hold it closed after that. So blinking with two eyes at the same time doesn’t feel so bad for me.