P3D Re: VM and Kids, VM interaxial/interocular

["Grant C. Campos" <gcc6094@xxxxxxxxxxxxxxxxxxxxx>]

I'm wondering if people are making the mistake of thinking that if the
viewers lenses are each 15mm wide, and they are 65mm apart, then they
would accomodate someone with an interocular of 50mm.  I don't know but,
it seems that the following factors would make the usable eye spacing
much closer to 60mm: the pupil is about 4mm wide, and the position of the
eyes are not fixed and move left to right to see the entire image, making
the resulting minimum interpupil distance used, severl less than the
person interocular, the didstance from then pupil to the lens is a 3mm or
more if you are blessed with a substantial schnozz.  It would be
interesting to see a sketch of the eyeball in front of a lens looking at
an image, or an equation showing the relationship between the size of
someones pupil, the distance from the eye to the lens, the focal
length of the lens, and the size of the image that can be seen.

I'll post my adventures with the Duke's viewer in another message.

Grant


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