Left or right?

[Asle F]

I use my left eye when photographing. That is what gives best ergonomic for me, because then the camera blocks the sight for the other eye. And my  thumb rests against the nose, so it doesn't get tired

I use the right eye when shooting, but that is off topic in this forum.

[Frank Fremerey]

I was a right eye.
The right I got bad.
I had to switch.
End of story.