Moving Target Recognition
Observe one digit from 0 to 9 moving across a bounded horizontal track, then choose the digit you saw after it is hidden. The target bounces smoothly between the selected travel limits, with position computed from elapsed time rather than frame count. This is a recognition practice game, not a clinical vision test. It records your answers without converting them into visual-acuity values, age grades or population percentiles.
Key features
- One securely selected digit from 0 to 9 and a random initial travel direction
- Four starting speeds, adaptive speed, four travel ranges and five exposure durations
- Elapsed-time motion with bounded horizontal bouncing and no flashing effects
- Still-target practice that respects the system’s reduced-motion preference
- Answer-after-observation flow with actual correct/attempt counts and accuracy
- Latest 30 attempts with mode and requested/observed timing, within a 100-attempt run
How to use
- Choose speed, travel range and exposure. Percentages refer to the usable inner track width, not physical distance. Enable adaptive mode to change the next speed by +15% for a correct answer or −10% for a wrong one.
- Use still-target practice if desired. When the device requests reduced motion, the target remains still automatically.
- Start observation explicitly and watch the digit. Answer buttons stay disabled while it is visible.
- After the target disappears, choose 0–9. Read whether your choice matched and start another attempt when ready.
- Review the recent attempt history or clear the run. Cancelling, hiding the tab, resizing during a trial or changing the motion preference discards that unfinished trial.
Use cases
- Play a short moving-digit recognition game
- Explore how selected speed and exposure affect this task
- Compare your own repeated attempts with unchanged settings
- Use a stationary target to practice the observe-then-answer flow without movement
Frequently asked questions
Is this a medical dynamic-vision or eyesight test?
No. It is an unstandardized browser recognition game. There is no eye tracking, calibrated physical target size, viewing-distance control or clinical procedure. Results are only counts of your answers in this run; they are not visual acuity, a diagnosis, an age grade or a population ranking.
What do speed and travel range mean?
Speed is a percentage of the usable inner track width per second. The four speeds are 30, 60, 90 and 120. Range is a centered span of 40, 60, 80 or 100 percent of that width. The digit starts at one end and bounces within that span. Actual physical distance depends on screen size and zoom. Speed and range do not move the target in still mode. Adaptive mode increases speed by 15% after a correct answer and decreases it by 10% after a wrong one, bounded to 15–240% of the inner track per second and rounded to one decimal. History shows the speed actually used for each trial.
Does it respect reduced motion?
Yes. Nothing moves until you start an observation. If the system requests reduced motion, the digit stays centered and the page labels this as still-target practice. You can also choose still mode yourself. A system motion-preference change during observation or answer entry discards that unfinished trial. There are no strobe, flashing or repeated full-screen color changes.
Are motion and exposure timings exact?
No. Position is computed from a monotonic clock’s elapsed time and updated with animation-frame callbacks, so a higher frame rate does not deliberately speed up the game. Real rendering, refresh rate and device load still affect presentation. The observed interval is browser clock time until hiding, not physical screen exposure. A callback more than 250 ms late discards the unfinished trial.
How are accuracy, history and the example counted?
Accuracy is correct answers divided by completed answers, shown to one decimal place. Cancelled or invalidated trials are excluded. A run stops at 100 completed answers and keeps the latest 30 history rows. The fixed example is clearly labeled; the next normal start clears its demonstration result. History includes still or moving mode, and these descriptive counts are not a standardized comparison across conditions.
Is this a reaction-time or concentration-grid game?
No. You identify a digit after its viewing window ends; response speed does not affect a score. There is no timed click at a signal and no grid of numbers to search. Answer buttons are unavailable during viewing. Leaving the tab during viewing or answer entry cancels the unfinished trial rather than recording a missed response.
Privacy
Settings, chosen answers and attempt history remain in this page’s memory. The tool does not send them to a server or tool analytics events and does not save them automatically. Resetting, changing settings or leaving the page clears the run. No camera, eye tracking or health information is requested.
Comments & questions