Instructions:
- After you click on next, you will see two images.
- Center your head 1 to 2 ft from screen (the
closer the better)
- Cross your eyes so that you see the images
single.
- The two horizontal lines should appear parallel.
If they are not, try to center your head better.
- Now tilt your head up slowly. You should see that
the lines no longer appear parallel.
- If you tilt you head down slowly, the lines
should tilt in the opposite directions.
- Remember how the lines were oriented when your
head was tilted down (i.e. when your eyes were
looking up).
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