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Posted by Jan Panteltje on 01/30/07 17:51
On a sunny day (Tue, 30 Jan 2007 11:35:32 -0500) it happened Rick Merrill
<rick0.merrill@NOSPAM.gmail.com> wrote in
<CtqdnblNcatI7iLYnZ2dnUVZ_qqdnZ2d@comcast.com>:
>
> From personal experience LCD screens are much better for the eyes.
>
>Studies of 19-24 yr olds who watched 8hrs or more of CRT had detectable
>early onset presbyopia. I showed the article to my Dr. Ophthalmologist
>and he said while the results are probable, the paper did not meet his
>standards for publication. The studies were done at UCLA about 10 yrs ago.
>
>They did not address the reasons. But there are several ideas: the glass
>distorts the view of each eye, the colors are easier for the eyes to
>focus upon, phosphor decays quickly while LCD pixels stay on longer...
>
>Safety is only an issue if the unit is destroyed: a CRT will shatter and
> it is possible for the yoke to shoot through the glass! X-Radiation
>is now well controlled and besides it heads out the back (away from the
>user).
I have been quiet in this thread now for long enough.
Reconsider your 'studies', I (and many others) have been watching CRT
for many hours a day from very young onwards, and especially for me as worked
for many years in a TV studio as technician, and had to repair and adjust these
things, walls of many of these, and did not get any 'Presbyopia' (see
http://en.wikipedia.org/wiki/Presbyopia ) until after 50, and so had others
in my family who NEVER looked TV, ... I'd say that argument (those studies)
make[s] no sense.
Many studies are made financed by some body or some organisation that _wants_
to prove something,. hardly independent, and then from those that are independent
there is usually quite an error bar, so without being specific it is no good.
Microsoft for example has financed several studies proving that 'MS Windows' is
better then (you name it).
That is all commercials :-)
As to CRT or LCD, I prefer CRT anytime for color, gamma, resolution.
And the geometry argument.. well current monitors (not TVs) are really very good.
CRT TVs are not so good the last time I checked, but I find gamma and picture of
the LCD big TVs I see in the shops not acceptable for color matching etc...
That may also be a bit because those guys never adjust the sets correctly, but I have
no control over that.
We had roentgen checks in the studio on the hold CRT sets, and it was considered 'safe'.
Whatever that may mean.
The old CRTs with tubes did produce a lot of radiation in the HV section, but
that was all packed in metal.
If you spend hours just an inch away... it does add up.
I would prefer a nice good LCD, but maybe it will never happen.
The white in LCD is never equally distributed, (back light is not even), the black level
is not really _that_ black....
OTOH I have seen nice pictures from LCD projectors... I do not like DLP with color wheels,,
CRT is a great thing, but as sales decline, competition no longer works, and then forget
about future quality of CRT if anyone will still make these.
Maybe plasma.... things are improving there, maybe DLP projectors with laser light sources.
For now however, if not in bright direct sunlight, it is CRT for me.
I have to point out that all this is my personal experience, if you have seen better LCDs
then you have seen better LCDs :-)
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