look, a color matching test
Liz
Look, a color test.
I got a perfect score (= 0), twice, even with cataracts.
I think maybe my cataract isn't normal, as it isn't just went grey
really fast. Also, I think the test may be easier for people who have
spent time fussing with Photoshop color casts, which I have.
Is there a contrast sensitivity test online?
thanks,
Liz
Indy
USA
The Real Bev
> http://www.xrite.com/custom_page.aspx?PageID=77
>
> Look, a color test.
> I got a perfect score (= 0), twice, even with cataracts.
> I think maybe my cataract isn't normal, as it isn't just went grey
> really fast. Also, I think the test may be easier for people who have
> spent time fussing with Photoshop color casts, which I have.
63. They looked OK, but possibly because I just got tired of moving little
squares around. When I went back to see if I could improve on what I'd done,
they were all wrong again :-(
> Is there a contrast sensitivity test online?
--
Cheers, Bev
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
"I can't stand this proliferation of paperwork. It's useless to
fight the forms. You've got to kill the people producing them."
-- Vladimir Kabaidze
Dr Judy
> http://www.xrite.com/custom_page.aspx?PageID=77
>
> Look, a color test.
> I got a perfect score (= 0), twice, even with cataracts.
A cataract would not make you fail a colour vision test.
Judy
Salmon Egg
The Real Bev <bashl...@gmail.com> wrote:
> Liz wrote:
>
> > http://www.xrite.com/custom_page.aspx?PageID=77
> >
> > Look, a color test.
> > I got a perfect score (= 0), twice, even with cataracts.
> > I think maybe my cataract isn't normal, as it isn't just went grey
> > really fast. Also, I think the test may be easier for people who have
> > spent time fussing with Photoshop color casts, which I have.
>
> 63. They looked OK, but possibly because I just got tired of moving little
> squares around. When I went back to see if I could improve on what I'd done,
> they were all wrong again :-(
>
> > Is there a contrast sensitivity test online?
I looked at that test. Color matching on a computer screen is
questionable. The spectra of the phosphors vary with the technology used
to produce light. Moreover, merely changing contrast on the screen will
affect the color distribution.
Bill
--
As the years go by, dying just before having to fill out a tax return has merit.
Don W
> A cataract would not make you fail a colour vision test.
>
> Judy
A cataract does not affect contrast?
Since when??
Don W.
Jan
Nobody did make this statement actually.
A colourvision test is different from a contrast sensitivity test.
And yes, cataract has effect on contrast.
Jan (normally Dutch spoken)
Don W
Ok thanks on the distinction.
But I suppose an aging cataract plays havoc to the color test.
Don W.
Mike Tyner
"Don W" <dwi...@prodigy.net> wrote
> But I suppose an aging cataract plays havoc to the color test.
I think sometimes it causes blue hair.
-MT
Don W
> "Don W" <dwil...@prodigy.net> wrote
>
> > But I suppose an aging cataract plays havoc to the color test.
>
> I think sometimes it causes blue hair.
>
> -MT
Yup,
The people that are really blue are the ones that don't have any.
Don W.
PS. Interesting to note that macular degeneration affects color
vision (color acuity).
.
Dr Judy
> On Nov 21, 6:08 am, "Mike Tyner" <mty...@mindspring.com> wrote:
>
> > "Don W" <dwil...@prodigy.net> wrote
>
> > > But I suppose an aging cataract plays havoc to the color test.>
> vision (color acuity).
Macular degeneration destroys the colour detecting cones while sparing
the non colour detecting rods. So yes, it affects colour vision
Liz: here is a brand new review (summary of many papers) on blue
blocking IOLs that should put your concerns about colour to rest:
Surv Ophthalmol. 2009 Oct 27. [Epub ahead of print]
Blue-Blocking IOLs: A Complete Review of the Literature.
Henderson BA, Grimes KJ.
Ophthalmic Consultants of Boston, and Harvard Medical School, Boston,
Massachusetts, USA.
Intraocular lenses (IOLs) that block both ultraviolet and blue
wavelength light (<500 nm) were introduced in the 1990s. Since then,
the potential benefits and harm from blocking blue light has been
debated. We report the results of a complete review of all peer-
reviewed published studies regarding the impact of blocking the
transmission of blue light. Fifty-six published reports on subjects
related to blue-blocking lenses including sleep disturbance, visual
outcomes, cataract surgery, lens transmittance, sunlight exposure, and
macular disease were found in peer reviewed journals from 1962 to
2009. Eleven reports specifically compared visual outcomes between
blue-blocking IOLs and non-blue-locking IOLs. Of these, 10 independent
studies (10/11, 91%) concluded that there are no significant effects
of blue-blocking IOLs on various meters of visual performance
including visual acuity, contrast sensitivity, color perception, and
photopic, mesopic, and scotopic sensitivities. Only one group of
authors reported that the use of blue-blocking IOLs may have
detrimental effects on scotopic vision and circadian rhythms. However,
the actual clinical significance of these potential negative effects
on scotopic vision and on sleep patterns is uncertain. The benefits of
blocking the transmission of blue light to the macula and the
relationship between progression of age-related macular degeneration
remain unclear. However, the published studies clearly state that the
use of blue-blocking IOLs is not detrimental in visual acuity, color
perception, and contrast sensitivity. The reported potential negative
effects on scotopic vision and sleep disturbance appear to be minimal
and may not be clinically relevant.
PMID: 19875141 [PubMed - as supplied by publisher]
Judy
Jane
research on this topic was sponsored by the lens manufacturers, with
findings consistent with the financial interests of the corporate
sponsor. I'll bet that the group who reported the "detrimental
effects on scotopic vision and circadian" (of uncertain clinical
significance) were paid consultants for AMO (Alcon's major competitor).
Don W
> Macular degeneration destroys the colour detecting cones while sparing
> the non colour detecting rods. So yes, it affects colour vision
>
Several references say, surprisingly enough, that the rods in MD
degenerate first.
Don W.
Liz
> blocking IOLs that should put your concerns about colour to rest:
>
> Surv Ophthalmol. 2009 Oct 27. [Epub ahead of print]
> Blue-Blocking IOLs: A Complete Review of the Literature.
> Henderson BA, Grimes KJ.
Ah, thank you. I have read a number of the studies, but no reviews.
I would like to pull up that reference on the circadian rhythm,
wherever it is; I've had trouble finding much on that issue (other
than shouting matches).
I still hate yellow (been talking to graphic designers who had their
eyes done). Hope to find an untinted acrylic that blocks UV to 400
nm. AMO is testing a "violet-blocking", but it's not out yet. :-(
thanks,
Liz
Indy