UTC Time:
Color Vision Deficiency (a.k.a. Color Blindness) Tests
-online since 2000
New On-line Test V5
(WASM-based powered by Uno Platform)
It may take 10 - 60 seconds to start depending on your device and network speed. We continue to improve its performance.
- Click button "=>" at the center of the test panel to begin the test.
- Look at the test panel consisting of color dots with one of the four shapes (square,
circle, triangle and star) embedded. Click the corresponding shape in the choice
panel to collect one test point. If you are unable to identify the shape, click
the last choice with a question mark.
- Repeat step 2 until achieving satisfactory score quality ("very good"
is recommended, "excellent" is the highest quality) which is displayed
on the bottom-left.
- Click button "=>>" below the choice panels to finish the test and
see the results.
The quality of the test depends on the quality of the display device (e.g. CRT).
Tom Niemann's
ePaperPress is a good website for helping calibrate monitors.
All of the reported data are simple, straight forward and self-explanatory statistical
parameters except the adjusted score which is the most important
number.
Adjusted score, in a nutshell, is the estimated true portion of correct response
in terms of percentage. For example, an adjusted score of 80 means it is estimated
that 80% of the time the testee truly knows the correct color adeuteranopia_test.jarnd the rest (20%)
of the time he chooses either "do not know" (i.e. the last choice with
a question mark) or a shape by guess. Since there are 4 choices, a completely color
blind person can get 1/4 of his responses right by randomly choosing among the fourlimited_confusion_lines.aspx
shapes. Therefore correct portion of 25% is translated to an adjusted score of 0
if "do not know" is never chosen.
It is possible to have negative adjusted score. This means the testee's color vision
is even worse than complete color blindness. In other words, the wrong colors are
more likely to be picked than the correct ones. In reality, the negative adjusted
score is usually a result of statistical variation, especially of small sample numbers.
The design of this test, due to its uniform image pattern, uniform background and
random brightness, does not allow any inherent negative adjusted scores.
The protanopia (missing long-wavelength photopigment) and deuteranopia (missing
middle-wavelength photopigment) tests are almost the same because the long (red)
wavelength photopigment's spectral sensitivity is very close to that of middle (green)
wavelength photopigment. In other words, protanopes and deuteranopes will
probably test positive on both tests.
limited_confusion_lines.aspx
Biyee color vision deficiency tests are based on research work originally carried out in the early 1990s at Cornell University. They were brought on-line in 2000. It went through different versions following the change of technical conditions for rich Internet applications (RIA). The on-line versions started as Java applets, migrated to Silverlight apps, then a WebAssembly app containing all tests currently.
Biyee color vision deficiency tests distinguish them from other digital color vision deficiency tests by creating unlimited random test patterns dynamically strictly following the principles of color vision deficiencies. Therefore, they are the most accurate for a given display device, far superior to those with a finite number of test images, especially those scanned images vulnerable to a variety of factors detrimental to the test accuracy.
It is important to keep in mind that the calibration of the display device is critical to the accuracy of any on-line color vision deficiency tests.
The test score processing server is
temporarily down but will be running soon. We
apologize for this.
Feedacbk:
I would like a smartphone version
for
iOS
View your
test data (Please note that the time stamp is in UTC due to the tests' international popularity).
This is experimental. Let us see if we can have discussions with civility, respect
for facts, and relevant contents truly useful for users.
Color Vision Test V4 (Silverlight-based)
Sorry, your browser does not support on-line Silverlight app.
diagnosing all three types of color vision deficiency
Normal test time: 60 - 200 sec
|
diagnosing protanopia
(a.k.a. red blindness)
Normal test time: 20 - 60 sec
|
diagnosing deuteranopia
(a.k.a. green blindness)
Normal test time: 20 - 60 sec
|
diagnosing tritanopia
(a.k.a. blue blindness)
Normal test time: 20 - 60 sec
|
Color Vision Test V3.12
|
diagnosing all three types of color vision deficiency
|
|
Protanopia Test
diagnosing protanopia
(a.k.a. red blindness)
|
Deuteranopia Test
diagnosing deuteranopia
(a.k.a. green blindness)
|
Tritanopia Test
diagnosing tritanopia
(a.k.a. blue blindness)
|
View your
test data (Please note that due to the test's international popularity,
the time stamp is UTC, not local time).
- Click button "Start" to begin the test.
- Click one of the three small squares which color matches the large test pane above
them. Each click is a sample point. The bottom bar shows the total test number and
the score quality gauged by margin of error.
- Repeat step 2 until achieving satisfactory score quality ("very good"
is recommended, "excellent" is the highest quality).
- Click button "Finish" to see the results.
The quality of the test depends on the quality of the display device (e.g. CRT).
Tom Niemann's
ePaperPress is a good Web site for helping calibrate monitors.
A good article about color vision deficiency.
All of the reported data are simple, straight forward and self-explanatory statistical
parameters except the adjusted score which is the most important
number.
Adjusted score, in a nutshell, is the estimated true portion of correct response
in terms of percentage. For example, an adjusted score of 80 means it is estimated
that 80% of the time the testee truly knows the correct color and the rest (20%)
of the time he just guesses. Since there are three choices, a completely color blind
person can get 1/3 of his responses right by randomly picking the choices. Therefore
correct portion of 33% is translated to an adjusted score of 0.
It is possible to have negative adjusted score. This means the testee's color vision
is even worse than complete color blindness. In other words, the wrong colors are
more likely to be picked than the correct ones. In reality, the negative adjusted
score is usually a result of statistical variation, especially of small sample numbers.
The design of this test, due to its uniform image pattern, uniform background and
random brightness, does not allow any inherent negative adjusted scores.
The protanopia (red-blind, missing long-wavelength photopigment) and deuteranopia
(green-blind, missing middle-wavelength photopigment) tests are almost the
same because the long (red) wavelength photopigment's spectral sensitivity is very
close to that of middle (green) wavelength photopigment. In other words, protanopes
and deuteranopes will probably test positive on both tests.
Color Vision Test V2.0
- Click button "Start"
- Click the button below the small square which color you believe is closest to that
of the main pane.
- Repeat step 2 as many times as you want (more than ten times preferred).
- Click button "Finish" to see the results.
Colblindor has a very readable blog explaining Color Vision Test V2.0,
especially, from the view of a color deficient person.
Color Vision Test V1.0:
(sorry, this obsolete test suite is no longer available).
- [2011-10-25] Rectangle and triangle shapes have been slightly reduced in size to
give some space between them and the edges of the test panel.
- [2011-10-25] Biyee Color Vision Test for Windows Phone was released.
- [2011-03-02] Biyee Color Vision Test Pro (Ver. β) was released.
- [2010-12-06] Biyee Online Color Vision Test V4 (pediatric friendly) was released.
- [2009-05-09] Biyee Online Color Vision Test V3.12 was released with improved test
score quality indicator.
- [2009-04-24] Biyee Online Color Vision Test V3.11 was released with significant
improvement of application responsiveness.
- [2009-03-28] Biyee Online Color Vision Test V3.10 was released with the long-anticipated
integrated test.
- [2009-03-18] Biyee Online Color Vision Test V3.03 was released with added test score
quality bar to indicate the test result accuracy.
- [2009-03-17] Biyee Online Color Vision Test V3.02 was released with added test score
quality gauge.
- [2008-12-27] Biyee Online Color Vision Test V3.01 was released to accommodate a
wide range of monitors and enhance accuracy.
- [2008-12-17] Color Vision Test V3.00 was released. First revision of Biyee online
color vision test suite since 2002-07-04.
- [2002-07-04] Color Vision Test V2.0
These color vision tests are based on the
confusion lines
.