Colr Blindness: Any New Aids These Days ?

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Robert11 - 08 Aug 2007 21:35 GMT

Hi,

Been a very long time since I asked if there were any new developments in
the way of
glasses (or other) to help with color-blindness (red and green
discrimination) these days ?

I remember a way back there was something about red tinted glasses becoming
available that possibly helped.

Anything new these days ?

Thanks,
Bob

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Salmon Egg - 09 Aug 2007 00:12 GMT

On 8/8/07 1:35 PM, in article a-mdna1BDbYztSfbnZ2dnUVZ_hGdnZ2d@comcast.com,

> Hi,
>
[quoted text clipped - 10 lines]
> Thanks,
> Bob

Given what is known about ordinary (sex linked from X chromosome defects)
color blindness, there is little that can be done. It is likely that you can
use filters (in the form of glasses) to enable discrimination between two
colors that cannot be distinguished without the filters. The penalty for
that will be poorer low level vision because filters remove light and
substitution of other pairs of indistinguishable colors. In other words, if
there is a pair of colors that you ABSOLUTELY MUST be able to distinguish
from one another, you probably could get a filter to help.

Bill
--
Fermez le Bush--less than 18 months to go.

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Mike Tyner - 09 Aug 2007 00:49 GMT

> substitution of other pairs of indistinguishable colors. In other words,
> if
> there is a pair of colors that you ABSOLUTELY MUST be able to distinguish
> from one another, you probably could get a filter to help.

Then you give it a trade name like "X-CHROM", get a patent, and charge a
license fee to anyone who uses the same color. Oh wait... somebody already
did that. :)

-MT

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Salmon Egg - 09 Aug 2007 04:17 GMT

On 8/8/07 4:49 PM, in article wpudnYd9PI83yyfbnZ2dnUVZ_tyknZ2d@giganews.com,

>> substitution of other pairs of indistinguishable colors. In other words,
>> if
[quoted text clipped - 6 lines]
>
> -MT

I responded to the question based on fundamental rather than specific
knowledge. To my mind, the fact that you can get patents on such so-called
inventions makes a travesty out of the United States Patent System. I would
expect anyone with a decent knowledge of optics and color would realize that
a suitably selected filter would help discriminate between two colors. I
have heard of color blind people being used to detect camouflaged
installations during WWI. I would be surprised if color filters were not
used about then for the same purpose.

Someone with normal vision might perceive two colors with different spectral
distributions to be of the same color. Spectrally pure yellow covers only a
very narrow portion of the visible spectrum. Most of what we perceive as
yellow is much broader including orange,red, and maybe some green. A filter
would help distinguish spectrally pure yellow from yellow scattered light
from broadband pigments.

Bill

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Support the troops. Impeach Bush. Oh, I forgot about Cheney.

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