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With enough practice it becomes really clear. There's no eye
chart anywhere in sight, but I can somehow make out:
AELTYPHEALT
I think it's a question of motivation.
Regards,
Jack
On Sat, 29 Dec 2001, John Clement wrote:
> Actually I discovered this in the early 60s by self testing my eyes with a
> wall mounted eye chart. At that time I had better than 20/20 and it
> improved to around 20/10 on the chart. I suspected, and still suspect that
> in my case part of the improvement is due to canceling out some of the
> effects of astigmatism. Since each eye has a dramatically different
> astigmatic correction, this is a distinct possibility. Now with a bit of
> presbyopia I find that my 2 eyes focus at slightly different distances, but
> the astigmatism produces a broader range of focus. Both eyes have
> noticeably better focus than either one alone. I believe in my case that
> the improvement may have been a couple of lines or so.
>
> Incidentally the presbyopia caused the 2 eyes to fail to work together as
> well. As a result I had to get glasses when some music I was attempting to
> read popped in and out of focus.
>
> I am surprised that the effect was discovered only in the 90s. I suspect
> that there are probably prior reported observations about the effect, but
> not necessarily with the degree of precision of the more recent findings.
> Probably the early writings about this effect have been overlooked because
> they are not in the medical journals. Maybe someone on this list has come
> across an autobiography or the writings of an older scientist who noticed
> this effect. I would not be at all surprised if Ben Franklin had written
> about it.
>
> John M. Clement
> Houston, TX
>
> >
> > At 04:03 PM 12/29/01, Ludwik wrote:
> > >During an eyes exam I recognized all letters in the first three
> > >rows with the left eye but not the letters in the fourth row. The
> > >same happened with my right eye. But all letters in the fourth
> > >row became clearly recognizable when both eyes were open.
> > >The doctor said that this is the synergetic (sp?) effect. I am
> > >trying to reproduce this at home but it is not as dramatic as in
> > >his office. Perhaps this strange effect is font-dependent or
> > >illumination-dependent. Any comments?
> > > Ludwik Kowalski
> >
> >
> > This URL leads one to expect an 11% or a half line improvement
> > on a visual chart on average for binocular versus monocular testing.
> >
> > <http://www.lighthouse.org/research_acuity.htm>
> >