Yesterday a friend came around, we chatted, drank coffee and made a protective case for his fancy magnetic clip-on sun glasses.
Making the case took a cup of coffee and an hour's causal work. First we gathered up some Baltic Birch plywood, and a bit of oak for the sides. There was cutting on the band saw and the mitre saw too. Next glutting and clamping with clothes pin size spring clamps.
You can never have too many clamps.
After the box was built and the glue somewhat dried we sanded the box and gave it a coat of dark paste wax. Now the lens are protected. Quick and easy 'cause I have lots of tools.