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.
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