Sure, its density thats the true variable I agree. But I dont think we know the true size of the screens so we cant work this out?
three of those headsets are similar in FOV so resolution will be a good proxy for density. The Index is the outlier because it's pixels are over a wider FOV, presumably lowering its pixel density?
Well even if you knew the size of the screens you still couldn't work it out unless you also knew pixel size, because two screens of the same size and the same pixel count, both being viewed through the same lenses with the same FoV, can have different pixel fill and thus SDE as shown in that image above.
Its not about the number of pixels in a given area, it's about how much of that area is filled by actual pixel.... A subtle difference perhaps, but contingent on realising that not all pixels are the same size. In a given area you can have X amount of tiny pixels with a lot of "dead" space, or you can have X amount of larger pixels with very little "dead" space. Resolution the same, screen size the same, fill factor very different.
The FoV or pixels per degree is something of a red herring in regard to SDE and I believe you are thinking of pixelation or perceived lack of resolution rather than SDE directly there. Given the exact same screen with a wider FoV of course the SDE will also become more noticeable as everything is being magnified, but again it's not directly related to the extent that you could say wider FoV headset A will have more SDE than narrower FoV headset B.
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