My understanding is that it’s actively bad for them. Not least, Virtual headsets and 3D tvs, over time, actively train your brain to break the connection between focal length and perceived distance, and damage your ability to visually experience depth in real life in the usual way.
That is, typically depth perception is done with a combination of convergence, eye-parallax, motion-parallax, and focal length: your eyes cross more as something gets closer, the difference between the images in each eye increases as it gets closer, your head moves a little as well, so your brain takes account of the change in view as you move even slightly, and your eyes have to focus closer. 3D imagery works on the first two, but can’t do anything about focal length on a flat screen, and it’s a really sophisticated system that can include really small movements of the head.
(I do not seem to experience the visual sensation of depth in the usual way either, but at least it wasn’t 3D TVs or too much Magic Eye in the '90s that did it. Indeed, I have never seen the sailboat, not once.)
