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Sure do!
You can go to any place that sells glasses (any eye Dr.--even Wal-Mart) and just purchase the frames. When you say "lenseless", that means that there is nothing at all within the frames (you could put your finger through the eyepiece of the frames). Don't you really mean prescriptionless or non-prescription? If so, you can still buy the frames and have them put a non-prescription glass, plastic, or carbonpolynate (think that's what it's called) lense in. It would basically be flat without the curvature that causes change in vision. I would think that it'd be somewhat cheaper than a prescription lense, too, but I'm not totally sure on that. They would, however, probably be more expensive than goggles.
Btw.... Slightly  I attend a lot of births at a hospital with a CNM. I don't think I've ever seen her wear goggles, nor a face shield. The only ones I've ever seen wear them here are the OBs. I guess I'm a little surprised that a homebirth midwife would think that she needs them. 
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