Ferwerda's book

[P3D John W Roberts <roberts@xxxxxxxxxxxxxxxxx>]

In the previous post, I should have mentioned that I consider Ferwerda's
book to be an excellent reference for 3D, but that I don't agree with
everything in it.

Case in point: section 21.8, on interpupillary distance:
"If a stereoscope should be adequate for most cases, interpupillary
 separations of 50 to 80 mm should be taken into account (3.4). Smaller values,
as occur with young children, are not important for stereoscopy (fig. 21.8A)."
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(The curve in the figure didn't give a breakdown by age.)
There's useful information on the distribution of interpupillary distance,
but I don't agree that stereoscopes for kids are unimportant. The text notes
that "stereopsis and spatial observation are not yet completely developed
in those younger than 10", but I don't believe that they have *no*
utility to that age group.

John R


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