Ophthalmic lens and manufacturing method thereof

1. An ophthalmic lens comprising:

a lens body; and

an antimicrobial hydrophilic layer formed on the surface of the lens body, comprising tannic acid and a zwitterionic polymer, wherein the zwitterionic polymer is selected from the group consisting of a phosphorylcholine polymer, a sulfobetaine polymer, a carboxybetaine polymer and a mixed-charge polymer, or combinations thereof.

2. The ophthalmic lens as claimed in claim 1 , wherein the zwitterionic polymer is selected from the group consisting of poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC), poly(sulfobetaine methacrylate) (PSBMA) and poly(carboxybetaine methacrylate) (PCBMA), or combinations thereof.

3. The ophthalmic lens as claimed in claim 1 , wherein the weight average molecular weight of the zwitterionic polymer is in the range of 10,000 to 300,000.

4. The ophthalmic lens as claimed in claim 1 , wherein the lens body is made of a hydrogel or a silicon hydrogel.

5. A method for manufacturing an ophthalmic lens comprising:

(a) providing a lens body;

(b) immersing the lens body in a tannic acid solution, wherein the tannic acid solution comprises polydopamine; and

(c) immersing the tannic acid treated lens body in a zwitterionic polymer solution, the zwitterionic polymer is selected from the group consisting of a phosphorylcholine polymer, a sulfobetaine polymer, a carboxybetaine polymer and a mixed-charge polymer, or combinations thereof.

6. The method for manufacturing an ophthalmic lens as claimed in claim 5 , wherein the concentration of the tannic acid solution is between 250 ppm to 2500 ppm, and the concentration of the polydopamine in the tannic acid solution is between 1 ppm to 20 ppm.

7. The method for manufacturing an ophthalmic lens as claimed in claim 5 , wherein in the step of (b), the tannic acid solution immersed with the lens body can be heated to a temperature of 30° C. to 80° C. for a time in the range of 5 minutes to 60 minutes.

8. The method for manufacturing an ophthalmic lens as claimed in claim 5 , wherein in the step of (c), the concentration of the zwitterionic polymer solution is between 500 ppm to 3000 ppm.

9. The method for manufacturing an ophthalmic lens as claimed in claim 5 , wherein the zwitterionic polymer solution can be heated to a temperature of 40° C. to 120° C. for a time in the range of 30 minutes to 120 minutes.

10. The method for manufacturing an ophthalmic lens as claimed in claim 5 , wherein the zwitterionic polymer is selected from the group consisting of poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC), poly(sulfobetaine methacrylate) (PCBMA) and poly(carboxybetaine methacrylate) (PCBMA), or combinations thereof.

11. A method for manufacturing an ophthalmic lens comprising:

(a) providing a lens body; and

(b) immersing the lens body in a solution comprising tannic acid, polydopamine and a zwitterionic polymer;

wherein the zwitterionic polymer is selected from the group consisting of a phosphorylcholine polymer, a sulfobetaine polymer, a carboxybetaine polymer and a mixed-charge polymer, or combinations thereof.

12. The method for manufacturing an ophthalmic lens as claimed in claim 11 , wherein the concentrations of the tannic acid, the polydopamine, the zwitterionic polymer are respectively from 150 ppm to 1200 ppm, from 0.5 ppm to 20 ppm and from 150 ppm to 1200 ppm in the solution comprising tannic acid, polydopamine and zwitterionic polymer.

13. The method for manufacturing an ophthalmic lens as claimed in claim 11 , wherein in step of (b), the solution comprising tannic acid, polydopamine and a zwitterionic polymer is heated to a temperature of 30° C. to 80° C. for a time in the range of 5 minutes to 60 minutes.

14. The method for manufacturing an ophthalmic lens as claimed in claim 11 , wherein the weight average molecular weight of the zwitterionic polymer is in the range of 10,000 to 300,000.