I completely agree with you about the tiredness of the eye or fatigueness of the eye. It's really hard to imagine someone wearing this kind of device for a very long time without feeling any pain. I'm not sure exactly the reason why this pain came from. But I think the question we face is going to be maybe the next big thing for humans, which is going to directly connect all those sensors directly connected to our central brain without using the eye. But that's kind of a science fiction thing. I'm not sure I'm going to have a chance to experience those things.