P3D Re: Unequal focus query

["Greg Wageman" <gjw@xxxxxxxxxx>]

From: Bob_Maxey@xxxxxxxxxxxx <Bob_Maxey@xxxxxxxxxxxx>


>Here is something to wonder about. Matched optics are important in
Stereo,
>but are our eyes perfectly matched? Has anyone ever looked into this
idea?
>My guess is that none of us have equally matched eyes and the brain
>accommodates this.


If one wears corrective lenses, as I do, then presumably one's
optometrist matches one's eyes for one. :-)

My prescription is due for an update, and I know for a fact that my left
eye's vision is sharper than my right eye's.  This doesn't seem to cause
me any problem, nor do I notice it except when I specifically block
alternate eyes and compare.  The whole seems indeed greater than the sum
of the parts.

But both my eyes produce the same *sized* image, so that homologous
points merge correctly.  I imagine that some severe vision defects
(short of blindness) might still destroy stereopsis.  For example, I
can't imagine that the late Marty Feldman saw in stereo!

     -Greg W. (gjw@xxxxxxxxxx)



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