Terry Casey wrote:

Much easier to use than trying to thread a bit of cotton through small holes
you can't see (because you're not wearing your glasses!)

Depends, my close sight is *much* better without the goggles.

I had to do some running repairs on my rimless glasses over the weekend,
the bridge and arms have pairs of 0.5mm pins that fit into holes drilled
in the lenses, with a plastic "gasket" that pushes in from the other
side to hold them in place ... one of which dropped off ... I cut two
strips of 2mm by 20mm strip from thick aluminium foil, rolled it into a
tight spiral and plugged the holes, then wedged the pins in, held quite
nicely until Tuesday when I popped into the optician for the another
free repair (you don't get that with mail-order!)