[photo-3d] focus and convergence again

["ron labbe" <ron@xxxxxxxxxxxx>]

JR writes:
>>I would agree that focus and convergence are usually coordinated functions
in that they usually occur simultaneously and by similar amounts, but they
certainly aren't "linked".

To make this more obvious, consider the situation of "synchronized
swimmers".  Their actions may appear to be identical, and they are
performing in the same medium (water), but it would be incorrect to state
that they were "linked".<<

I can't agree with this (OBVIOUS?) comparison at all! The two swimmers are
consciously making an effort to coordinate their efforts, but one does not
have to consciously focus their eyes at the same time they are converging.
One goes through the three dimensional world with those two eye functions
NORMALLY LINKED: when you look at something far away, your are focussed AND
converged far away. When you look at something close, you FOCUS and CONVERGE
on something close. This is normal and as unconscious as breathing. Of
course, they CAN be unlinked! But the only time I can think of when they
ARE, is for the stereoscopic illusion of three dimensions, when you are
focused at one place, but converged at any distance... when else?


ron

ron labbe
studio 3D

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