Yes, we use double blind studies and look for reproducibility of results, ideally from different researchers. We do this to try and remove subjective bias.
It's great, but the next layer of bias that will need to be assessed and dealt with is now on the horizon. And it's not so subjective, more the opposite. From evolutionary biology & psychology we learn of instinct blindness. The fact that human brains developed instinctual reactions to certain stimuli through selection pressure, over a long period of time, means two things. 1) they're pretty much all the same, and (2) their perceptual and cognitive systems are fundamentally instinctual, though mental capacities to override instinct have more recently emerged.
Consider separation. Seems pretty reasonable, huh? I mean I'm here and well, the laptop is just there. Oh, the wall's over there. Until we remove the subject, I, out of the scenario. Now everything is just object. Everything looks the same but the sense of hard boundaries is dispersing. It's more like a TV screen. Now, a masked gunman has just walked into the room! Ah good, hard boundaries again, instinctual responses override this non-dual spaciness. Glad I learned to fight. That's him dealt with. You get the idea?
Perception, distance - I mean they look real. And in any situation where the brain's instinctual response to danger (or other favoured stimuli) is triggered they will seem real as hell. But that guy measuring the distance between those two points, well that's just an action taking place! Where's the real significance?