| 摘要 |
A substrate is made by polymerizing a reaction mixture of a major amount of a primary pre-polymer which is cross-linkable and a minor amount of a secondary pre- polymer which is not cross-linkable to form a reaction product, such as an optical lens, which is then contacted with a photochromic moiety to imbibe or diffuse the moiety into at least a surface layer of the reaction product.
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