I don't think I got sick, but had a hard time because of my bad vision, and was fearful of getting eyestrain headaches. I commented to a colleague that the device would benefit from some sort of corrective adjustment of the optics, such as the "diopter" and "pupillary distance" adjustments in a high quality microscope. And apparently a certain fraction of people have limited or no stereo vision. The pupillary distance could be done digitally.