I just test oculus go.
I can't see the black ring of lenses edge if I look the object which be so far.
But when there are some objects which be closed to my eye and when I watch them, I can see the black ring of lenses at the middle of my eye easily.
When I try to remove the face cover, I don't found those issues when I look to the closed object, but can see the display edge instead.
Not sure because Oculus go don't have IPD adjustment or not, but don't found this issues when test psvr.