Ophthalmic lens and method for manufacturing the same

1. A contact lens, comprising:

a lens body;

a polydopamine layer formed on a 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

a first cellulose nanofiber (CNF) layer bonded to the polydopamine layer;

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 lens body is made of a hydrogel or a silicon hydrogel.

3. The contact lens according to claim 1 , further comprising a hydrophilic layer formed by bonding a second cellulose nanofiber to the first cellulose nanofiber (CNF) layer.

4. A contact lens, comprising:

a lens body;

a polydopamine layer formed on a 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;

a first cellulose nanofiber (CNF) layer bonded to the polydopamine layer; and

a functional layer bonded to the first cellulose nanofiber layer;

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%.

5. The contact lens according to claim 4 , wherein the functional layer is selected from one of the group consisting of a second cellulose nanofiber, a zwitterionic polymer, a zwitterionic copolymer and a reactive dye or a combination thereof.

6. 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 30 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 first cellulose nanofiber and a crosslinking agent to form a first cellulose nanofiber layer bonded to the polydopamine layer;

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%.

7. The method for manufacturing the contact lens according to claim 6 , wherein the concentration of the polydopamine solution is in the range of 50 ppm to 400 ppm.

8. The method for manufacturing the contact lens according to claim 6 , wherein the solution containing the first cellulose nanofiberand and the crosslinking agent is heated at the temperature in the range of 60° C. to 121° C. in the step of (c).

9. The method for manufacturing the contact lens according to claim 6 , wherein the polydopamine-coated lens body is immersed in the solution containing the first cellulose nanofiberand and the crosslinking agent for a time in the range of 20 minutes to 90 minutes in the step of (c).

10. The method for manufacturing the contact lens according to claim 6 , wherein the concentration of the first cellulose nanofiber is in the range of 300 ppm to 1500 ppm.

11. The method for manufacturing the contact lens according to claim 6 , 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.

12. The method for manufacturing the contact lens according to claim 6 , wherein the concentration of the crosslinking agent is in the range of 100 ppm to 600 ppm.

13. The method for manufacturing the contact lens according to claim 6 , further comprising the step of (d) immersing the lens body having first cellulose nanofiber layer in a solution containing a second cellulose nanofiber to form a second cellulose nanofiber layer on the first cellulose nanofiber layer.

14. The method for manufacturing the contact lens according to claim 13 , wherein the solution containing the second cellulose nanofiber is heated at the temperature in the range of 60° C. to 121° C. in the step of (d).

15. The method for manufacturing the contact lens according to claim 13 , wherein the lens body having first cellulose nanofiber layer is immersed in the solution containing the second cellulose nanofiber for a time in the range of 20 minutes to 90 minutes in the step of (d).

16. The method for manufacturing the contact lens according to claim 13 , wherein the concentration of the second cellulose nanofiber is in the range of 500 ppm to 1500 ppm.