Colour perception: cones, tetrachromacy and online tests

Two people can find the same colour task very different. Screen settings and viewing conditions also affect what an online colour test can show.

Tetrachromacy concerns differences in colour perception. A screen-based colour game records performance on its own task; a high score does not establish a fourth functional colour channel.

Differences in colour vision can affect particular distinctions without describing someone's other visual abilities. The patterns below illustrate the task rather than establish professional suitability.

Record display and brightness settings if you want to compare attempts. A higher score on another screen may reflect the setup as well as the person; describe the task result before making broader claims.