I've had thick plastic lenses and thin plastic lenses. I've had thick
glass lenses and thin glass lenses. Being near sighted my lenses are
thinnest in the center and thick at the edges. The thin lenses are
thinner at the edges.
The people who made them said they use high refractive index material to
make them thinner. They didn't say anything about resistance to
breaking.
-jeff
----- Original Message -----
From: "Joe Gwinn" <joegwinn@xxxxxxxxxxx>
>
> It has nothing to do with refractive index. The issue is safety:
plastic can be thin because it doesn't shatter into lots of razor-sharp
pieces.
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