T3D Re: A Third Simple One

[john bercovitz <bercov@xxxxxxxxxxx>]

> I wonder though.  Even though the eye's lens has lost its flexibility
> and can no longer accommodate, the muscles are still trying, aren't
> they?  So in spite of the inability to change accommodation, one might
> still experience the related eyestrain the same as though one could,
> yes?

I can only speak for myself but there must be someone else out there 
with trifocals or bifocals who can confirm or deny.  If my eyes are 
put in a position where they must try to accommodate, I feel the strain 
of the attempt so I just insert the correct magnifier to take care of 
the problem.  Then my eyes quit straining.  Doesn't matter whether it's
one of the lenses in my glasses or a headband magnifier for close work.

As an interesting aside, there was an article in Scientific American not
too long ago about loss of accommodation.  I think the gist of the article
was that the lens does not so much harden as move anteriorly putting the
muscles or ligaments at a mechanical disadvantage.  I can't find the 
article on Scientific American's web site.

John B


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