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B.  Test the device before use 
C.  To have the best performance, adjust pupillary distance to make your 

pupils align to the glass cente 

 

D.  Adjust focal distance on the top until the device performs the best 
E.  The front panel is removable, after removing the front panel, camera of 

smart phone is exposed. 

 

 

 

 

 

 

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