Instructables

Step 4: Swap and Trim Lenses

Exchange the two lenses as shown in the photo.  Due to how the lenses are made, we have to keep them facing the same direction as they originally were in the glasses.  Using the retainer piece as a template, trim the edge of the lens off so it will fit into the frame.
 
Remove these adsRemove these ads by Signing Up
bbartók3 years ago
Well, if this is true, then you should reach the same result by flipping the original lens.
nope, if you do that is the same 'cause you flip both lenses, you get the same efect but inverted, and its looks kinda weird.