Hi
You get double vision from the lenses not being parallel to each other.
The first thing to check when you buy the goggles is if the front faces are flat inside and out, then put them on and get a buddy to check if the front faces are parallel to each other across with a straight edge (up and down wont matter as you can adjust this)
If the are nearly there then you can adjust them later with the nose strap and the head strap
I also put the goggles on and marked the centre of my eyes by looking straight out and drawing a cross with a chinagraph pencil to get the rough lens position
To check the lens angle in the goggles dry, put on a bright light and look at it through the fitted lenses and you will see one big dot (hopefully)
or you can adjust to get one big dot with the straps and moving each goggle on your face
hope this helps
Andre.
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