[manasecret]

At my new job, we inspect our own electronic boards for quality control. We use dual eye-pieced microscopes, and some employees use them for eight hours a day. After using them for awhile myself, I realize the effect is much like 3D stereoscopic vision. Basically, two completely different images are projected to your eyes, one for each eye. It can be hard to focus sometimes because of the two images, and it's an odd thing to handle for the eyes. But it's done and been done that way for years and years, and we're just one small company. I'm sure the same is done by virtually all quality control for PCBs.

Because of that, I think there has been plenty of research on the effects of stereoscopic projections on eyesight, and since not much is heard about it, it's IMO likely not a big deal.