Eye calibration is part of the research study, so it's tied to your player ID. Open the main app to create an ID (or sign in), then come back here — your progress will be saved to that ID across sessions.
Go to the main appFirst compare 10 colour pairs. Then play your full 10-round mixing match.
You'll see pairs of colours drawn from the game's palette, one after another. For each pair you answer up to two quick questions: first “Are they identical?” — and if not, “If this were your mix, would you accept it as a match?” Some pairs are identical, some are obvious; most are subtle. There are no right answers and no feedback — just judge what you see.
It takes under 2 minutes. Best on a non-dimmed screen in even lighting. Do it across a few short sessions on different days — that's by design, and the picture of your eyes gets sharper each time.
Tip: you can also press 1 for yes, 2 for no.
Are they identical?
Pooled across all your sessions. The smaller the perceptibility figure, the finer the colour differences you can tell apart; acceptability is how far a match can drift before you'd no longer accept it.