《 Please do this exercise with the naked eye. 》
①When you'll see two balls are overlapped each other, 3 balls seems to appears in the screen, you can get the hang for this exercise.
②This line'll be calibrated to about 8 cm,only as a guide.
③About 1 m distance from the screen,depending on screen size,only as a guide.
Please regulate yourself of the ability to see.
Please relax your body's muscles,eyes and shoulders.