A lens including a lens substrate, a surface layer, and a backing member provided
beneath the surface layer, in which the backing member may be either the same as
the lens substrate or a separate layer from the lens substrate, and wherein the
surface layer includes a hydrolysis-condensation product of a perfluoropolyether
modified silane with a hydrolysable functional group or a halogen atom X at both
terminals, represented by a general formula (1) shown below:
##STR1##
(wherein, Rf is a bivalent group with a straight chain perfluoropolyether
structure containing no branching, which incorporates a unit represented by a formula
—(CkF2kO)— (wherein, k represents an integer
from 1 to 6)) is resistant to the adhesion of contaminants to the surface thereof,
can be easily wiped to remove any adhered contaminants, provides a slippery surface
that is difficult to scratch, and moreover displays excellent durability and is
capable of retaining the above properties over extended periods.