If a human is standing or sitting, is there a preferred angle in which the eyes are most comfortable when staring ahead? Maybe there's a clinical trial out there with research?
The reason I ask is that some articles on the internet explain that a TV should be mounted at eye level. So the center of a TV should be mounted straight ahead. I've also read articles where the most ergonomic position of computer monitors is slightly below straight ahead, for the center of the monitors.
I've observed that people with neurological muscular conditions (ie: MS, MD, SMA), angle their head upward a little bit, but their eyes stare downward naturally (but is actually straight ahead when you compare the offset). I've had SMA Type II for 32 years, so that's my own observation.