If you have an older pair of prescription glasses you can pop the lenses out of you can build them into goggles or a mask.
I made a pair of shop glasses out of an existing pair of shop glasses, lenses from my old eyeglasses, a piece of 1/16" polycarbonate and a bolt. The eyeglass lenses fit behind the lenses of the shop glasses, and are held in place by a piece of polycarbonate that has been bent to hold the eyeglass lenses in. I drilled a hole in the center top of the shop glasses and the polycarbonate back piece and used a bolt to hold it in place, where it is putting pressure on the eyeglass lenses to keep them set.

Because they are much thicker than the original shop glasses were designed for, they ride a bit forward towards the tip of my nose, but when worn with a particulate shop mask, the fit is perfect.
