I don't think I've ever seen a dumbbell shaped glass eyes for sell, but individual eyes are easy enough to make.
Melt the end of a piece of monofilament with a lighter to form a "ball" on the end of the mono, then slide a glass bead onto the mono. The "ball" of mono keeps the bead from falling off.
I've always just made one of these "eyes" for each side and tied them in separately, but you could put two beads on one piece of mono and then melt both ends of the mono to create a homemade "glass and mono barbell eye".
You end up with eyes that look like this:
Plastic bead chain is available from most fly tying suppliers if you'd rather use plastic eyes.