Yes exactly. The "camera" (I assume you mean lenses?) is not the issue, it's your own IPD vs. the game's "world scale" (i.e. how far apart in the game space the two cameras/"eyes") are apart from eachother. Any game that gives you a world scale adjustment will be able to solve any and all problems without you having to mod your HMD (with one exception - the lenses themselves have a sweet spot so there is a physical switch on all HMDs as far as I am aware that helps you change the lens separation so you can align the sweet spot with your eyes, and if your eyes are too wide or narrow, then you might need to physically mod that, and I do understand that this also plays a small role in the world scale too).
It's actually a fascinating topic because the implication is that we actually DO see the world differently in real life too. If your eyes are 6cm apart and mine are 7cm, I will actually see things a bit dinkier than you, and when I go into a game that hangs it's in-game cameras 6cm apart, everything will feel unusually completely wrong, but you'd see it as normal, even though we both seeing the same thing. Really cool.
Yup! ...although, that dial, that lets you physically adjust the distance between the lens+screen assemblies, so that they match your interpupillary distance, also informs the game about this IPD, so that it can space its cameras correspondingly (this is why the world stays put, when turning the dial, almost making you question whether it has any effect at all).
Given this, there should never really need to
be any world scale slider in any game - it should come out right by default - always, due to auto-adjusting to your IPD, as reported either by the dial (assuming the user has actually done their part, for their own comfort), or in some newer high end headsets (the latest StarVR, and Xtal) measured by their built-in eye-tracking cameras.
The obvious exceptions are when one's IPD is narrower (like mine) or wider, than the adjustment range of one's HMD can accomodate, and when the developer has deliberately set the game cameras for a particular character, so that one can e.g, experience the world as a child anew, or through the eyes of a small animal, or a giant. -I recall there was a lot of talk, at some point, about an experience where one could get a simulated taste for the eyesight of various animals, but I don't think anybody ever took the idea and ran with it... :/
In
my case, though, I actually didn't mod the lateral distance lens-to-lens, but changed the
optical path, by shimming the lenses up 1.5mm, away from the display panels, producing a corresponding increase in diopters. :7