fitting the lens
The lenses are CR39 optical grade plano clear and are used as demo lenses. That
is they are to demonstrate to the dispensing optometrist just how they are held
in the frame, and will act as a template for them. Each disc shape is sawn out
of a 70mm blank and filed with a bevel to suit the vee-groove I made in the
Note here that the lens doesn't quite fit yet. More grinding to be done to trim the lens size down.
This set of images © Brian Adam, 2005