<P> Mirrored lenses have a metallic, partially reflective coating on the outer surface combined with a tinted glass lens . Mirrored lenses of different colors can expand the range of fashion styles . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2010) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> There are various words referring to eyepieces with darkened lenses: </P>

When was the first pair of sunglasses invented