Well, we have our own take on the matter. Just think about how Neji sees tenketsu. Isn't that objects that are supposedly infinitesimal and near to him? Focus. There it is.So you mean despite looking 360 v , the Hyuga can focus their vision on other parts of body (not eyes) ??
I do understand this ... A Byakugan user can focus on objects far away . However he automatically sees all objects that are close to him (because of 360 v)....
All I mean is : "If the Uchiha is close to the Hyuga , Can the Hyuga avoid looking at his eyes ?" ... I think not .
Then, we might not know truly.