Ophthalmic lens and method for manufacturing the same

1. A contact lens, comprising:

a lens body;

a polydopamine layer formed on the surface of the lens body by immersing the lens body in a polydopamine solution prepared from dopamine in alkaline environments and heating at the temperature in the range of 40° C. to 80° C. for a period of time in the range of 5 minutes to 60 minutes; and

an antimicrobial layer bonded to the polydopamine layer and formed from a copolymer of carboxyl-containing polymer and zwitterionic polymer and a crosslinking agent, wherein the zwitterionic polymer is selected from one of the group consisting of phosphorylcholine polymer, sulfobetaine polymer, carboxybetaine polymer and mixed-charge polymer or a combination thereof;

wherein the polydopamine layer is substantially colorless on the contact lens; and

wherein the visible light transmittance of the contact lens is not less than 92%.

2. The contact lens according to claim 1 , wherein the zwitterionic polymer is selected from one of the group consisting of poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC), poly(sulfobetaine methacrylate) (PSBMA) and poly(carboxybetaine methacrylate) (PCBMA) or a combination thereof.

3. The contact lens according to claim 1 , wherein a weight average molecular weight of the copolymer of carboxyl-containing polymer and zwitterionic polymer is in the range of 10,000 to 500,000.

4. The contact lens according to claim 1 , wherein the carboxyl-containing polymer is poly acrylic acid (PAA) and/or poly methacrylic acid (PMA).

5. The contact lens according to claim 1 , wherein the crosslinking agent is selected from one of the group consisting of 1,4-butanediol diglycidyl ether (BDDE), polyethylene glycol diacrylate (PEGDA), ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, polypropylene glycol diglycidyl ether, polytetramethylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, polyglycerol polyglycidyl ether, diglycerolpolyglycidyl ether, glycerol polyglycidyl ether, tri-methylolpropanepolyglycidyl ether, pentaerythritolpolyglycidyl ether, sorbitol polyglycidyl ether, 1,2,7,8-diepoxyoctane, 1,3-butadiene diepoxide, polyamidoamineepichlorohydrin and copolymer of dimethylamine and epichlorohydrin or a combination thereof.

6. The contact lens according to claim 1 , wherein the lens body is made of a hydrogel or a silicon hydrogel.

7. A method for manufacturing a contact lens, comprising steps of:

(a) providing a lens body, and immersing the lens body in a polydopamine solution prepared from dopamine in alkaline environments and heating at the temperature in the range of 40° C. to 80° C. for a period of time in the range of 5 minutes to 60 minutes to coat a polydopamine layer on a surface of the lens body;

(b) washing the polydopamine-coated lens body; and

(c) immersing the polydopamine-coated lens body in a solution containing a copolymer of carboxyl-containing polymer and zwitterionic polymer and a crosslinking agent to form an antimicrobial layer bonded to the polydopamine layer;

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

wherein the polydopamine layer is substantially colorless on the contact lens; and

wherein the visible light transmittance of the contact lens is not less than 92%.

8. The method for manufacturing the contact lens according to claim 7 , wherein the zwitterionic polymer is selected from one of the group consisting of poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC), poly(sulfobetaine methacrylate) (PSBMA) and poly(carboxybetaine methacrylate) (PCBMA) or a combination thereof.

9. The method for manufacturing the contact lens according to claim 7 , wherein the concentration of the polydopamine solution is in the range of 25 ppm to 500 ppm.

10. The method for manufacturing the contact lens according to claim 7 , wherein the concentration of the copolymer of carboxyl-containing polymer and zwitterionic polymer is in the range of 200 ppm to 2000 ppm.

11. The method for manufacturing the contact lens according to claim 7 , wherein the solution containing copolymer of carboxyl-containing polymer and zwitterionic polymer and the crosslinking agent is heated at the temperature in the range of 60° C. to 121° C. in the step of (c).

12. The method for manufacturing the contact lens according to claim 7 , wherein the polydopamine-coated lens body is immersed in the solution containing the copolymer of carboxyl-containing polymer and zwitterionic polymer and the crosslinking agent for a time in the range of 20 minutes to 90 minutes in the step of (c).

13. The method for manufacturing the contact lens according to claim 7 , wherein the weight average molecular weight of the copolymer of carboxyl-containing polymer and zwitterionic polymer is in the range of 10,000 to 50,000.

14. The method for manufacturing the contact lens according to claim 7 , wherein the carboxyl-containing polymer is poly acrylic acid (PAA) and/or poly methacrylic acid (PMA).

15. The method for manufacturing the contact lens according to claim 7 , wherein the concentration of the crosslinking agent is in the range of 100 ppm to 1000 ppm.

16. The method for manufacturing the contact lens according to claim 7 , wherein the crosslinking agent is selected from one of the group consisting of 1,4-butanediol diglycidyl ether (BDDE), polyethylene glycol diacrylate (PEGDA), ethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, polypropylene glycol diglycidyl ether, polytetramethylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, polyglycerol polyglycidyl ether, diglycerolpolyglycidyl ether, glycerol polyglycidyl ether, tri-methylolpropanepolyglycidyl ether, pentaerythritolpolyglycidyl ether, sorbitol polyglycidyl ether, 1,2,7,8-diepoxyoctane, 1,3-butadiene diepoxide, polyamidoamineepichlorohydrin and copolymer of dimethylamine and epichlorohydrin or a combination thereof.