Thanks, that is nicely explained --- you finished the thinking I had only started! Are the eyes mechanically capable of pointing outward (so the interpupillary

Thanks, that is nicely explained --- you finished the thinking I had only started! Are the eyes mechanically capable of pointing outward (so the interpupillary distance is not longer a constraint)? If so, is the problem then neurological not mechanical (brain doesn't want to send signal so they do that)?