First, you want to hold the tube in front of one
eye and with both eyes look at something in the
distance (approximately 10 to 15 feet away). Next,
hold your free
hand (the one not holding the tube) up in front
of the eye that is not looking through the tube. Your hands and eyes should
now be positioned similar to the illustration
above.
What You'll See:
You should see a round hole in the palm of your
hand. The object that you were looking at in the
distance should be perfectly visible through this
hole.
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