As a long time rider I've had numerous closer than close close calls with various objects hitting me in the face whilst riding. I do both MTB and road riding. Both have their various items to duck out of the way of!
Wearing my usual daily wear prescription glasses has always been something to avoid. I don't want to break them nor do I trust them to truly protect my precious eyeballs. I'm both a human and a photographer so my eyeballs are a cherished resource!
In the past I've worn various impact resistant glasses. None of which were prescription. These worked well enough but um I be getting older and my vision prescription keeps getting "worse".
So I knuckled down and bought a pair of Rudy Project glasses. They are polarized, photochromic (which means they get darker/lighter as the ambient light changes), progressives for both distance and reading and tough as hell for impact resistance.
I can now SEE that rock kicked up by an SUV coming at me at 40MPH as I fly down a hill!! LOL!! I really can SEE better with them and I can wear these year round which is a good thing!
You don't have to spend as much as I did but I do strongly urge everyone to take eye protection while riding seriously. Have ya ever been pegged in the face by a bumble bee while riding at speed?! Holy cow that hurts!!