Actually, as the OP states, the issue is with focal distance. The military has been using AR/VR in heads up displays for decades now and have had to work aroun

Actually, as the OP states, the issue is with focal distance. The military has been using AR/VR in heads up displays for decades now and have had to work around these issues. When a user is forced to focus on a 2d projection of a 3d field, it creates all the issues people have with VR including: vertigo, nausea, eye strain, anxiety, and malaise. Motion exasperates the issue.