Re: Without intending offense

On Mon, 20 Feb 2006 00:23:26 +0200 Ioannis <morpheus@xxxxxxxxxxxx> wrote:
| <phil-news-nospam@xxxxxxxx> wrote in message
| news:dtang501om@xxxxxxxxxxxxxxxxxxxx
| [snip]
|
|> I think the issue is more about the corrective lenses than about my
|> own eyes. At the edges of the lenses, not only is there a difference
|> in size of different colors, but a different offset as well. At the
|> optical center, all the colors center up quite well, but the sizes
|> still cause problems. And I cannot keep moving my head around to
|> keep the point I view in the optical center axis.
| [snip]
|
| Yes. See a recent post of mine in sci.optics, where the achromaticity of the
| "perfect eye" is addressed through a simple experiment.

I am definitely very nearsighted. I forget the exact amount or the
presciption of my glasses. However, without my glasses, I do not see
much separation of red and blue. With the glasses (one single glass
element so no chromatic correction at all) the separation of red and
blue is quite significant. Supposedly this could be fixed somewhat
with achromatic lenses, or better with apochromatic lenses, but I don't
want to be walking around with such thick lenses. So until some major
technological innovation in extreme refractive indexes in glass or other
material, I'll just have to live with this. Avoiding fluorescent lights
is one of the things I must do.

Do keep in mind that with a continuous emission spectra, the impact is
not nearly as great as it is with 3 discrete spectral lines. A light
source that can emit, or at least mimic, a continuous spectrum, should
be reasonably workable. Incandescent works fine. I have no idea how
many discrete lines from individual, but different wavelenth, LEDs could
have the same effect. I'm just guessing that 24 would work. I wonder
if there are enough different fluorescent materials that could be mixed
in atube that could work, too.

--
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| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
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.

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