Interference fitting polar resin ophthalmic lens molding devices and related methods
View Patent ↗Ophthalmic lens molds include first and second mold members sized and adapted to be assembled, for example interference fitted, together to define a lens-shaped cavity therebetween. At least one of the mold members includes a polar polymeric material and has a flexural modulus less than 3800 MPa.
1. A method of making a silicone hydrogel contact lens, comprising:
curing a polymerizable silicone hydrogel lens precursor composition located in a lens shaped cavity of a mold comprising a first mold member and a second mold member sized and adapted to be assembled together to define the lens-shaped cavity therebetween, at least one of the first mold member and the second mold member comprising a mixture of a polar polymeric material and a different hydrophobic polymeric material and having a flexural modulus less than 3800 MPa.
2. The method of claim 1 , wherein the at least one of the first mold member and the second mold member has a flexural modulus less than about 3000 MPa.
3. The method of claim 1 , wherein both the first mold member and the second mold member comprise the mixture of the polar polymeric material and the different hydrophobic polymeric material.
4. The method of claim 1 wherein the at least one of the first mold member and the second mold member comprising the mixture further includes a plasticizer component in an amount effective to reduce the flexural modulus of the at least one of the first and second mold member relative to an identical at least one of the first and second mold member without the plasticizer component.
5. The method of claim 1 , wherein the first and second mold members are assembled together.
6. The method of claim 5 , further comprising the step of placing the polymerizable silicone hydrogel lens precursor composition in the lens shaped cavity.
7. The method of claim 1 , wherein the first mold member and the second mold member are structured to produce an ophthalmic lens having a rounded posterior edge portion.
8. The method of claim 1 , wherein the at least one of the first mold member and the second mold member has a contact angle less than 90° using the captive bubble method.
9. The method of claim 1 , wherein the polar polymeric material comprises a hydrophilic polymer.
10. The method of claim 1 , wherein the mixture comprises a mixture of ethylene vinyl alcohol and a non-polar polymer.
11. The method of claim 1 , wherein the polar polymeric material comprises polyvinyl alcohol.
12. The method of claim 1 , wherein the mixture comprises a mixture including polyvinyl alcohol and a non-hydrophilic polymer.
13. The method of claim 1 , further comprising at least one step selected from the group consisting of:
demolding the mold containing a polymerized silicone hydrogel contact lens product;
delensing the polymerized silicone hydrogel contact lens product from one of the mold members of the mold;
extracting an extractable component from the polymerized silicone hydrogel contact lens product to produce an extracted polymerized silicone hydrogel contact lens product;
hydrating the extracted polymerized silicone hydrogel contact lens product to produce a hydrated silicone hydrogel contact lens;
packaging the hydrated silicone hydrogel contact lens; and sterilizing the hydrated silicone hydrogel contact lens.
14. A method of making a silicone hydrogel contact lens, comprising:
curing a polymerizable silicone hydrogel lens precursor composition in direct contact with a lens shaped cavity of a mold comprising a first mold member and a second mold member sized and adapted to be assembled together to define the lens-shaped cavity therebetween, at least one of the first mold member and the second mold member comprising a mixture of a polar polymeric material and a different hydrophobic polymeric material, and having a flexural modulus less than 3800MPa.
15. The method of claim 14 , wherein the flexural modulus is less than about 3000MPa.
16. The method of claim 14 , wherein the polar polymeric material further comprises a plasticizer component in an amount effective to reduce the flexural modulus of a mold body of the at least one of the first mold member and the second mold member relative to an identical mold body without the plasticizer component.
17. The method of claim 14 , wherein the at least one of the first mold member and the second mold member is structured to be assembled with another mold member to define a lens-shaped cavity therebetween.
18. The method of claim 14 , wherein the at least one of the first mold member and the second mold member is structured to produce an ophthalmic lens having a rounded posterior edge portion.
19. The method of claim 14 , wherein the at least one of the first mold member and the second mold member has a lens defining surface having a contact angle less than 90° using the captive bubble method.
20. The method of claim 14 , wherein the polar polymeric material comprises ethylene vinyl alcohol.
21. The method of claim 14 , wherein the ethylene vinyl alcohol has an equivalent ethylene content greater than 38 mol %.
22. The method of claim 14 , wherein the polar polymeric material comprises a hydrophilic polymer.
23. A method of making a silicone hydrogel contact lens, comprising:
curing a polymerizable silicone hydrogel lens precursor composition in direct contact with a lens shaped cavity of a mold comprising a first mold member and a second mold member sized and adapted to be assembled together to define the lens-shaped cavity therebetween, at least one of the first mold member and the second mold member comprising a mixture including a hydrophilic polar polymer and a non-hydrophilic polymer, and having a flexural modulus less than 3800 MPa.
24. The method of claim 23 , wherein the mixture comprises a mixture of ethylene vinyl alcohol and a non-polar polymer.
25. The method of claim 23 , wherein the polar polymeric material comprises polyvinyl alcohol.