In your entire life your eyes dart around countless times chasing your focus and you may never complete a full circle by rolling your eyes because there's nothing demanding us to do that except for stress relief which many overlook. Rolling your eyes in circles heals you and its something a large portion of the world will probably never do. This and many other things is why I think so many have issues with eye health. Another one is glances upward or downward affecting the shape of the skull and jaw due to our re-orientation waiting on stressful factors to end which typically don't when speaking of electromagnetic forces or gravity vs the animals muscular refrain.