This depends on which kind of material your sunglasses belong to. If the lenses of your sunglasses are made by glass, you can put them in warm water, different material will swell to different extend. So we can use this theory to help remove the loctite. But if the lenses are made by plastics, this way may not work. It will be very hard for you to remove them, and you may need to turn to an optician. And the UV coating may be removed from your lenses too.

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