If they switch out so easily with a little lift of your fingers I imagine that
they may be easily lost in a fall on the ski slopes when you lose your glasses
or take a face full of snow that dislodges one or both of the lenses but not the
frames. But it is a novel idea and an excellent solution for people that do
multiple activities and need different glasses for each activity but only want
to buy one pair for everything.
Novel idea! Excellent article.