Originally Posted by
Slaninar
Never had a pebble hit my eyes, ever, in 30 years of cycling. So while it is possible, I doubt it's probable.

Those who get hit by pebbles in the (region of) the eye should definitely wear protection.
Last night I rode through a recently-opened construction zone that was not swept up, I got a grain of sand in my eye before I was able to squint, and then was getting a lot of very small pebbles (large grains of sand?) in my face for about 100yd.
It's not common enough to make me wear glasses on every ride though.