A quick colour blindness test

Discussion in '35mm Cameras' started by m II, May 6, 2007.

  1. m II

    m II Guest

    m II, May 6, 2007
    #1
    1. Advertisements

  2. m II

    Matthew Winn Guest

    The Ishihara Test is rather unreliable. It's far too sensitive to
    environmental lighting, and not only does it sometimes claim that
    people with even slightly reduced sensitivity to red are incapable
    of distinguishing between red and green, but also it passes as normal
    people who are completely unable to see green at all.

    The Farnsworth Arrangement Test is far more useful:
    http://www.univie.ac.at/Vergl-Physiologie/colortest/colortestF-en.html

    Other tests:
    http://www.colblindor.com/2007/02/0...-confusion-lines-of-the-cie-1931-color-space/
    http://www.opticien-lentilles.com/daltonien_beta/new_test_daltonien.php
     
    Matthew Winn, May 7, 2007
    #2
    1. Advertisements

  3. m II

    Paul Furman Guest

    Damn, not quite perfect :-(

    Score: (normal)
    angle: 61.98 (62)
    major radius: 8.85 (9.2)
    minor radius: 7.21 (6.7)
    total error: 11.42 (11.4)
    s-index: 1.23 (1.38)
    c-index: 0.96 (1.00)
     
    Paul Furman, May 7, 2007
    #3
  4. m II

    Pudentame Guest

    Look at the graphic. If you get something like a horseshoe leaning to
    the right, it's close enough to perfect. If you've got a deficiency,
    you'll see the line cross itself or loop.
     
    Pudentame, May 7, 2007
    #4
  5. m II

    Colin_D Guest

    Snap. My score is identical to yours, and my color vision is ok.

    Colin D.
     
    Colin_D, May 8, 2007
    #5
  6. m II

    Mark² Guest

    I'm not sure I see where the above score indicates any errors at all.
    The circles on mine were in the correct order, that being the only possible
    correct order...and the score numbers are identical. If that's the only
    order that works, then how does this indicate any problem at all? I don't
    think there is any other way to arrange the circles that wouldn't render an
    obvious error.
    What gives?
     
    Mark², May 10, 2007
    #6
  7. It is just that the applet calculates the scores with some error and its authors
    didn't care to fix it. If you get a C-shaped curve on the diagram, then your
    arrangement is 100% perfect, period.
     
    Andrey Tarasevich, May 10, 2007
    #7
  8. m II

    Mark² Guest

    That was my point. I see no reason for any "error" indicators here, so long
    as you get the backward "c."
     
    Mark², May 10, 2007
    #8
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.