Yes, you need the space. There was a site I was reading some time ago that mentioned with glasses, the geometry of your eyes converging on point nearby (ie sli

Yes, you need the space. There was a site I was reading some time ago that mentioned with glasses, the geometry of your eyes converging on point nearby (ie slightly 'cross-eyed') doesn't correspond with the eye muscles relaxed, for focusing at 'infinity'. The 'control systems' are likely coupled. I've used glasses with smaller screens, and I've noticed my eyes behaving a bit strange (perhaps seemed harder to focus) when alternating between glasses/no glasses. No idea if there are any other consequences. Maybe it's fine.