While sunglasses technically fall into the “accessory” category of running gear , they’re pretty much a non-negotiable for me—even on overcast days, I want to protect my eyes (and the skin around them) from squinting and harsh UV light. Reflections off the water this time of year can be brutal, and can make running more dangerous than it needs to be. Moreover, on trail runs , the right pair of lenses can help with depth perception and balance in both high- and low-contrast conditions. When you’re doing your own shopping for running glasses, look for picks with 100-percent UV protection, a rubberized nose bridge and temple arm tips for grip, and be sure to know whether you want polarization . Polarized lenses are great for glare protection and clarity in bright light, but non-polarized lenses can be better for trail running depth perception.…