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Instead of crossing your eyes to focus in front of the image, you have to uncross them and focus on something behind the image. Put your finger about six inches in front of your face and then look at the horizon. If the horizon is in focus you should see two fingers.


Focusing behind is much easier because you can get yourself started by focusing on an actual object.


Focusing in front can be done by focusing on an actual object too? Many people e.g. put a finger between them and the picture and then remove it.


The finger method interferes more with the third image in my experience.




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