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Medical Forum / General / Vision / September 2005

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Eyestrain discovery

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GG - 27 Sep 2005 22:58 GMT
I just realized that telescopes, binoculars and probably microscopes can  
also introduce eyestrain if focused a certain way. If one focuses them so  
the image is just slightsly blurred (just slightly not totally  
blurred....duh) eyestrain is much less but I'm not sure if eyestrain is  
always introduced by using any correction at all.  I've never thought of a  
telescope as a form of correction but it seems to bring up the same  
effects as vision correcting minus lenses.  Wondering if anyone else has  
noticed this?
Otis, pipe up over there.  What's your opinion?  I've never read or heard  
of this concept mentioned before.  Have I discovered something new?  Am I  
a pioneer?  This is exciting.  For a computer nerd with their head  
imbedded in their computer monitor that is.....:)
Dr Judy - 28 Sep 2005 00:52 GMT
>I just realized that telescopes, binoculars and probably microscopes can
>also introduce eyestrain if focused a certain way. If one focuses them so
[quoted text clipped - 8 lines]
> a pioneer?  This is exciting.  For a computer nerd with their head
> imbedded in their computer monitor that is.....:)

Microscopes and telescopes are set for optical infinity so that you should
not need to adjust the focus if using with your distance glasses on.  If you
want to use them with your glasses off, then you can adjust the focus to
compensate for your distance refractive error (either + or -).

I'm not sure what discovery you mean by "new".  If you mean that you can use
a telescope instead of glasses, no that is not new.  Optically, using a
focused telescope is the same as wearing glasses, it affects the light
entering the eyes the same way.  But it has the major disadvantages of
reducing field of view, requiring higher light levels and being quite heavy.

Dr Judy
otisbrown@pa.net - 28 Sep 2005 02:29 GMT
Dear Georgeous G,

I just realized that telescopes, binoculars and probably microscopes
can
also introduce eyestrain if focused a certain way.

Otis>  If you turn the eye-piece "out"
they you set it for the maximum "far"
distance.  If "in" then the maximum
"near" distance.  This is a fucntion of your
stop-to-stop accommodation.

If one focuses them so
the image is just slightsly blurred (just slightly not totally
blurred....duh) eyestrain is much less

Otis> If you run the eye piece "out" then that is like looking at
distant objects.
If you wish to call looking at distant objects "no eye-strain" then you
would be correct.

but I'm not sure if eyestrain is
always introduced by using any correction at all.  I've never thought
of a
telescope as a form of correction but it seems to bring up the same
effects as vision correcting minus lenses.

Otis>  If adjusted as I stated, then
it is as though the object you
see is "in the distance" optically.

Otis>  The same effect can
be achieved with a plus lens
if your eye-chart is at 20/40.

Wondering if anyone else has
noticed this?

Otis, pipe up over there.

Otis>  As you suggest. In fact
you could design and build
a "telescope" that when
properly calibrated would
"read" your refractive status
directly!  This way you would not
have to run to an OD to
establish exactly where you stand refractive state wise.

What's your opinion?  I've never read or heard
of this concept mentioned before.

Otis>  I think it is a good statement.  I like the concept of having
you measure your refractive state directly.

Have I discovered something new?  Am I
a pioneer?

Otis>  No you are attempting to over-throw conventional optometry.

This is exciting.  For a computer nerd with their head
imbedded in their computer monitor that is.....:)

Otis>  If you enjoy thinking and analysis of the dynamic behavior of
the natural eye, then you are getting it "right".

Best,

Otis

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