Close your left eye.
Adjust the distance between yourself and the screen until the Blind spot disappear from the screen,
then pressed the spacebar to start the test.

Press the "Spacebar" everytime you see a flashing dot.
Pressing the "Spacebar" when there is no flashing dot has no effect.
At the end of the test the result will be displayed.
Press the "Esc" at anytime to restart the test.

If the keyboard does not seem to response, then try clicking anywhere within the circle first.

Note: The whole application, including the graphics is not more than 8k only