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How to take out lenses from your sunglasses
Set the glasses with the wings open on a flat surface.
Look, then, at the corners and see what, if anything, is fastening the wings (ear pieces) to the rims around the lenses. If you have trouble seeing this area, use a magnifying glass and more lighting.
Some plastic frames have the wings (ear pieces) attached by a hinge embedded in the frame, so you will not be able to remove it easily, nor should you try to force it. If this is the case, skip the next step.