Target Eye : Both = Stereoscopic??

Hi Developers! I'm in newbie in VR dev...

I'm continueing team project and I get a previous work from ex-team mate.

That project used Oculus VR and seems like modified basic head tracking tutorial.

And used 2 cameras for Stereoscopic(Not a same screen, each camera shows little bit different ones).



like a drawing above.


and I'm using VIVE Pro Eye.. and I find Target Eye : Both.

Is it same function with that drawing above?
works like 2 cameras with convergence value 10? or just shows same screen each VR lens?

https://docs.unity3d.com/ScriptReference/Camera-stereoTargetEye.html
this reference doc gives just simple description..

I need your help veterans!