I recently bought a pair of Leupold Yosemite 8X30's with twist-down eyecups just like Charles P's. They're the first binos I've ever used that I can actually see through while wearing my glasses. When looking through them, I have my index fingers on the top of the eyecups and resting against my forehead to keep the binos steady & focus with my ring fingers. Not perfect, but it works. I cant' quite see the full image, but what I do see is clear & sharp.