Various non-limiting embodiments disclosed herein related to photochromic
materials comprising the reaction product of (a) at least one
ring-opening cyclic monomer, and (b) a photochromic initiator. Other
non-limiting embodiments related to photochromic materials represented
by: ##STR00001## wherein S' comprises the at least one ring-opened
cyclic monomer as set forth herein. Other non-limiting embodiments
related to photochromic compositions, optical elements, and methods of
inhibiting migration of a photochromic material in a polymeric material
using the photochromic materials disclosed herein. Methods of making such
photochromic materials, compositions, and optical elements are also
disclosed.