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Posted by Rick Merrill on 01/30/07 16:35
Bill wrote:
> I'm curious about this information. I've heard it often enough to
> wonder if it isn't "conventional wisdom" without any basis in scientific
> research. Is it? The "placebo effect" can be very powerful. Has
> anyone ever done a carefully structured study of the issue?
>
> Fred wrote:
>> Elan Magavi wrote:
>>
>> Has anybody considered that the LCDs have no flicker and so are much
>> less
>> tiring and cause less eye strain. I believe there are no X-rays from
>> LCDs
>> either. The CRTs are supposed to be shielded by thick glass, but I never
>> put much faith in the engineers when companies are driven more by profits
>> than public safety.
>> I got a 22" LCD screen, (wide format and HD capable), when I
>> got my new
>> computer. I just love it.
>>
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).
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