Cast lens
An ophthalmic lens incorporating an optically functional wafer having improved adhesion to a polymerized polyurea-urethane bulk lens resin.
1. An ophthalmic lens comprising:
an optically functional wafer;
a base material layer of a polymerized polyurea-urethane lens resin; and
a wafer treatment comprising an aliphatic polycarbonate polyurethane dispersion or a polysiloxane adhering the optically functional wafer to the base material layer of the polymerized polyurea-urethane lens resin;
wherein a composition of said polymerized polyurea-urethane lens resin comprises a mixture of:
an aliphatic diisocyanate component,
a dual amine/hydroxyl functional containing component, and/or
a hydroxyl-containing component.
2. The ophthalmic lens of claim 1 , wherein the optically functional wafer comprises a photochromic polyurethane layer.
3. The ophthalmic lens of claim 1 , wherein the optically functional wafer comprises an optically functional layer interposed between two transparent protective layers.
4. The ophthalmic lens of claim 1 , wherein the optically functional wafer comprises a polycarbonate protective layer.
5. The ophthalmic lens of claim 1 , wherein the wafer treatment comprises a dip coating.
6. The ophthalmic lens of claim 1 , wherein the wafer treatment comprises an elongation of up to 500 percent.
7. The ophthalmic lens of claim 1 , wherein the wafer treatment comprises an elastic modulus greater than 15 MPa.
8. The ophthalmic lens of claim 1 , wherein said aliphatic diisocyanate is a cyclo-aliphatic diisocyanate.
9. The ophthalmic lens of claim 1 , wherein a mixing ratio of said aliphatic diisocyanate to a sum of amino and hydroxyl functionalities is in a range of 0.9 to 1.1.
10. An ophthalmic lens comprising:
an optically functional wafer having a first side and a second side having an adhesion improving coating;
a first base material layer of a polymerized polyurea-urethane lens resin adhered adjacent the adhesion improving coating on the first side of the optically functional wafer; and
a second base material layer of a polymerized polyurea-urethane lens resin adhered adjacent the adhesion improving coating on the second side of the optically functional wafer.
11. The ophthalmic lens of claim 10 , wherein the optically functional wafer comprises a polarizing layer.
12. The ophthalmic lens of claim 10 , wherein the optically functional wafer comprises a polycarbonate protective layer.
13. The ophthalmic lens of claim 10 , wherein the adhesion improving coating comprises an aliphatic polycarbonate polyurethane dispersion.
14. The ophthalmic lens of claim 10 , wherein the adhesion improving coating comprises a polysiloxane.