Some products, mainly frames that look great as sunspecs, have the option of mirror coating.
The mirror coats come in two varieties:-
Silver mirror with a G15 full suntint beneath the mirror, this blocks 85% of light and is a Grey / Green colour.
Gold mirror with a B15 full suntint beneath the mirror, this blocks 85% of light and is a warm Brown colour.
Eyewear - Glasses - Spectacles - Ready Readers - The Spectacle Works - Copyright 2013