the goggles ws wears are definitely custom made. there're two straps per side, looking close at the design it actually looks like a domino mask around the lenses. probably inspired by bucky's domino mask in the comics.
well, just keep this in mind. Winter Soldier wears a turtleneck under all his gear. check the neck line and his right sleeve cuff in the stills and footage, you'll see it.
After a few hours of squinting at stills, pausing trailers and B-roll. Finally found the optic on WS' M4: Academy - EOTech XPS2 1x Holographic Sight
Hefty price tag, but the EOTECH logo and markings on the top, the battery port on the front, and the recessed adjustment screws match...