Do you wear reading glasses?

I do. Just now one of the lenses fell out because a miniature screw fell out.
Of course there was no chance of finding it
Now I have to go back to where I purchased them for repairs.
Such a design flaw that has been around for as long as the modern era glasses have been around.
I think a better method would be to use rivets instead of screws.
They would never fall out.
If one needed stronger lenses, then the rivet could be drilled out.