From: "Ron Blue" <rcb5@msn.com>
To: "Color and Vision Network" <cvnet@lawton.ewind.com>
Cc: <a.c.kooijman@med.rug.nl>
Subject: Re: CVNet - reply to color vision testing thread
I would have to agree with Aart statement that which type of fluorescent
tube you are doing your experiments may be important. I suspect that I was
using classical fluorescent tubes when I was able to use a subjective color
illusion machine to get blue/yellow color blind people to see blue a color
that they had never seen before.
Interestingly, one of the students, a male, was blue/yellow color blind due
to a car accident. The procedure generated blue again for him which he
remember from his childhood days. Red for red/green color blind students
also occurred under the classical fluorescent tubes by using a different
procedure.
Ron Blue
----- Original Message -----
From: "Color and Vision Network" <cvnet@lawton.ewind.com>
To: <CVNetList@lawton.ewind.com>
Sent: Tuesday, May 30, 2000 11:49 AM
Subject: CVNet - reply to color vision testing thread
> From: "Aart Kooijman" <a.c.kooijman@med.rug.nl>
> Organization: faculty of medical sciences (RuG)
> To: Color and Vision Network <cvnet@lawton.ewind.com>
> Subject: Re: CVNet - query on interpretation of color vision tests
>
> Dear Gene,
> You do not specify the type of fluorescent tubes that were used. That
> information is essential to understand your results.
> Fluorescent tubes vary very much in colour, due to the number of
> phosphors in the tube. Modern fluorecscent tubes are available with
> good and very good colour reproduction qualities. For instance,
> colour tests can be performed with the use of the Philips 960.The
> number 9 indicates a colour reproduction score between 90-100 on a
> scale of 0-100. Classical fluorescent tubes score between 30-40. The
> number 60 indicates a colour temperature of about 6000K, which
> corresponds with day light. I guess that your results on the colour
> test will normalise if you used a fluorescent tube with comparable
> specifications.
>
> Best wishes
>
> Aart Kooijman
>
>
> > From: Gene4@aol.com
> > Subject: Assistance Requested
> > To: cvnet@lawton.ewind.com
> >
> > I would appreciate assistance from the group. The test results below
are
> > from two individuals applying to become police officers. The indoor
tests
> > were given in March. The Outdoor tests given in May.
> >
> > Three color vision tests were given to two persons: Ishihara,
Farnsworth
> > D-15 and Lanthony 15 Hue. Both were desaturated panel tests.
> >
> > The Ishihara and Farnsworth were administered in an office under
florescent
> > lighting and outside in sunlight. The Lanthony in sunlight only.
> >
> > Person 1 Results:
> >
> > INDOOR Florescent Lighting:
> > Isihara: Unknown: Results recorded as "fail."
> > Farnsworth: 1, 2, 15, 3, 14 4 ,13, 5, 12, 11, 6, 10, 7, 9, 8
> >
> >
> > OUTDOOR Sunlight
> > Ishihara: 17 out of 17 correct
> > Farnsworth: Perfect Score
> > Lanthony: 1,15,2,14,5,13,12,4,5,11,10,6,9,7,8
> >
> > The test is being used in an employment process. The Lanthony was given
due
> > to concerns the individual might have obtained a Farnsworth to practice
on.
> > I suspect this person wore an x-chrom lens that was undetected during
the
> > test (the physician did not check). Is there another explanation for
these
> > scores?
> >
> > Person 2 Results
> >
> > INDOOR Florescent Lighting:
> > Isihara: 1 out of 7 plates correct.
> > Farnsworth: 1, 15, 2, 14, 3, 13, 4, 5, 12, 11, 6, 10, 7, 9, 8
> >
> >
> > OUTDOOR Sunlight
> > Ishihara: 17 out of 17 correct
> > Farnsworth: Perfect Score
> > Lanthony: Perfect Score
> >
> > Is it possible to have obtained results like this without cheating on
the
> > test with an x-chrom lens?
> >
> > Gene Carmean
> > GCarmean@med-tox.com
> > www.med-tox.com
> >
> >
> ================================================================
> ECVP2000 (The European Conference on Visual Perception) will be held in
> Groningen,
> The Netherlands from 27-31 August 2000. Info: http://ecvp.org/
> =================================================================
> Prof.Dr. Aart C. Kooijman
> Visio chair of Videology
> Editor of Visual Impairment Research
(http://www.swets.nl/sps/journals/vir1.html)
> ===============================================
> Laboratory of Experimental Ophthalmology (LEO)
> School of Behavioral and Cognitive Neurosciences (BCN)
> Hanzeplein 1, 9713 GZ Groningen
> P.O.Box 30 001, 9700 RB Groningen, The Netherlands
> tel. +31 (0)50 3612165, fax +31 (0)50 3611636
>
>
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