Four steps. Every one of them produces a number you can check yourself.
Measure your current performance. Short tasks with a fixed design so results are repeatable.
Practice specific skills. Sessions group related tasks; later they adapt to your results.
Track meaningful metrics — latency, accuracy, consistency, thresholds — never a single vanity score.
See your performance change over time, against your own history on your own device.
You will get better at the tasks you practise. That is well established. Whether that improvement reaches anything outside the task — driving, reading, sport, a game — is a separate question, and the evidence for it is weak. We don't claim it.
Nothing here measures your eyes directly. There is no webcam and no eye tracker. Tasks record what your hands and decisions do in response to what you see, which is a real and useful thing to measure — as long as it is described honestly.
Reported times include display and input latency from your own hardware, typically 10–50 ms. Compare against your own past results, not against someone else's setup.
