Information about the color blind tests
Contents
- Important notes about online color blind tests
- Background information about the color blind tests
- Efficiency of the online color blind tests
Important notes about online color blind tests
Please note that computer based color blindness tests do not give the same results as the original tests (example Ishihara, D15). Computer displays have only three primary colors. The colors of the printed books cannot be simulated by a display.
Online color blind tests are not suitable for clinical diagnosis!
Before you start the test:
- Remove any glasses with colored lenses.
- Please perform at least the following screen calibration:
- Set the brightness of your device to maximum (but minimum 75%).
- If you use any color filter settings (night mode, blue light filter, color blind filter) please turn it off!
- Do not expose the screen to direct light (best in the dark or with minimal backlight).
- If you are using a monitor, the contrast should be at least 75% and the color temperature should be set to “warm”.
Background information about the color blind tests
Efficiency of the online color blind tests
The effectiveness of the online color blind tests can be described as follows:
Sensitivity: The probability that the test will actually diagnose color blindness in (true) color blind subjects. In other words, it shows how reliably it detects the existence of color blindness.
Specificity: The probability that a test will actually diagnose normal color vision in subjects with normal color vision. In other words, it shows how reliably it diagnoses normal color vision.
Positive predictivity: The probability of how many of the subjects diagnosed with color blindness are actually color blind.
Negative predictivity: The probability of how many of the subjects diagnosed with normal color vision actually have normal color vision.
The effectiveness of the tests can be found in “Learn more / Background information" section.
