What is a good glue to fix a broken pair of spy sunglasses frames?

[Barco]

I have already tried super glue and it bonds for a little while and then just breaks again.

[Bard]

When you buy sunglasses, you should ask the seller whether the lens can be replaced or not.Or you ask the seller to recommend the sunglasses whose lens can be replaced for you.

[Bardolph]

Try soldering them . If it doesn't work,either,you should buy a new pair of that sunglasses.