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Blink Test flashes a single character on screen for a few milliseconds and asks what it was. There is nothing to track, nothing to remember for long and no strategy — the entire task is whether your visual system registered the thing at all before it was gone. Twenty rounds, and the display time gets shorter as you succeed.
Press Start and look at the centre of the screen.
A character flashes — usually too fast to feel like you saw it.
Choose which character it was from the options given.
Correct answers shorten the flash for the next round.
Twenty rounds; your score is the shortest duration you could still read.
Visual processing speed — the floor on how quickly your eyes and brain can turn light into an identifiable symbol. It is one of the cognitive measures that most clearly slows with age, and one of the few that responds to deliberate practice.
Fix your gaze on the exact centre before the flash. There is no time to move your eyes once it appears.
Do not blink deliberately between rounds. Time your blinks for the gap after you answer.
Trust the first impression. If you 'did not see it' but a letter came to mind, choose that letter — you are usually right.
Brightness matters. A dim screen costs you several milliseconds of effective processing time.
Very. Your visual system often registers the character below the level you experience as seeing. Acting on that hunch reliably beats deliberating.
No — there is no speed requirement on your answer. It measures how briefly something can appear and still be identified.
Not directly. Reading speed is limited by comprehension far more than by character recognition.
Tiredness hits visual processing speed hard, and so does a dimmer screen or glare. Compare runs made in similar conditions.