This is an application of testing vision acuity (VA).
Stay about 50cm away from the screen, and push the button on the same orientation as the image. Measurement VA is approximate value. 1.0 corresponds to 20/20 or 6/6.
Stay about 50cm away from the screen, and push the button on the same orientation as the image. Measurement VA is approximate value. 1.0 corresponds to 20/20 or 6/6.
Recently changed in this version:
* Vibrate when hold down button.





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