The "quick answer" to the general question of the lens length of the human eye seems to be 50mm, or so Google tells me.  But if I dig a bit, there is debate about this, at least for 3D representation.  Does binocularity affect the matter, or other factors?  To be Poser-specific, is Poser's camera handling consistent with the more general debate?  Is it the same as in other 3D contexts, or are there quirks to consider?

Trying to "eyeball" it (is that a pun?  No?  Umm.  :unsure:), setting a dolly camera to 50mm Focal doesn't seem to accurately represent what I would expect to see if I were standing in the environment.  I have to go much lower before I feel comfortable with the peripheral range of the displayed image.  But I'd rather be accurate than guess, or I'd at least like to know the correct answer before I decide whether to favor it or not.

Does anyone have any idea? 

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.