Method for manufacturing photochromic lenses

A method comprising:

• providing a plastic optical substrate having a bonding surface;
• providing a mold having a molding surface;
• providing an uncured resin that, upon curing, has a cross link density that is lower than said plastic optical substrate and forms a soft matrix;
• arranging the uncured resin, the optical substrate, and the mold such that the uncured resin is disposed between the bonding surface of the optical substrate and the molding surface of the mold;
• curing the uncured resin composition such that said resin composition forms a soft matrix that is bonded to the bonding surface of the optical substrate;
• and
• impregnating the soft matrix with a photochromic material.

A method comprising:

• providing a plastic optical substrate having a bonding surface;
• providing an uncured resin that, upon curing, has a lower cross link density than said plastic optical substrate;
• arranging the uncured resin on the bonding surface of the optical substrate;
• curing the uncured resin to form a matrix that is bonded to the bonding surface of the optical substrate;
• and
• impregnating the matrix with a photochromic material.

A method for making photochromatic composite plastic lenses, preforms or semifinished blanks comprising:

• providing a finished or semifinished plastic lens, preform or semifinished blank having a bonding surface;
• providing an uncured resin that, upon curing, has a cross link density that is lower than said plastic lens, preform or semifinished blank and forms a soft matrix;
• arranging the uncured resin on said bonding surface;
• curing the uncured resin to form a matrix that is bonded to the bonding surface;
• impregnating the matrix with a photochromic material to form a photochromic layer;
• and
• providing an outer resin layer having a high crosslink density after cure on said photochromic layer.