Re: free-viewing

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

>Date: Tue, 24 Sep 1996 14:58:36 GMT
>From: P3D  <decougny@xxxxxxxxxxxxxx>
>To: photo-3d@xxxxxxxxxxxxxxx
>Subject: free-viewing
>Message-ID: <199609241458.OAA27518@xxxxxxxxxxxxxxxxxxxx>
>
[deleted]
>
>I also have some concern about free-viewing hurting the eyes ...
>my eyes have a natural tendency to diverge ... so my eye-doctor
>always tells me to do eye-exercises that forces my eyes to converge (like
>converging on something small near my nose) ... if I free-view with the
>wall-eye
>method,
>ain 't I doing exactly the opposite ??
>

Yup.

>
>all in all, is free-viewing (wall-eye) bad when ur eyes naturally diverge ??
>

My eyes have a similar tendency & it used to lead to frequent eyestrain
headaches.  My optometrist determined that my eye muscles were very strong,
however, so rather than trying to exercise them further she gave me a
prescription with some prism built-in (shifting the images apart so that I
diverge more than normal at any given distance).  This helped a lot with
the headaches.  I suppose I might have problems for a while if I switched
back to a prescription without the prism, but I figure that given that I'm
already dependent on glasses to get around one more degree of dependence
doesn't matter too much.

So anyway, I don't think free-viewing would be harmful provided your eye
muscles are in reasonable shape.  You might experiment to see whether it
slows down the gains in eye-muscle strength from the exercises...

-Jim C.

----------------------
Jim Crowell
Division of Biology
216-76
Caltech
Pasadena, CA
(818) 395-8337
jim@xxxxxxxxxxxxxxx



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