Stereo Convergence does not have any effect

I am trying to load a project in an Epson 3d projector using side by side settings. When i change the Stereo Separation i can see results, but when i change the Stereo Convergence nothing happens. Does anyone know the reason convergence doesn’t work??
Thanks anyway.

it’s for 3D TVs… no one knows why the option is there for VR cameras, however if you do make games for 3D TVs, it’s an important setting.