Contact Lenses With Incorporated Components
A contact lens comprises a hydrogel lens body and a non-expandable object embedded within the hydrogel lens body. The surface energy of the non-expandable object and the modulus of the hydrogel lens body are selected so as to reduce distortion during hydration of the hydrogel.
1 . A contact lens comprising:
a. a hydrogel lens body having a modulus (M); and
b. a non-expandable object having a surface energy (SE) embedded within the hydrogel lens body,
wherein the hydrogel lens body i) comprises an N-vinyl amide component, or ii) is characterized by a bonding factor, X, of 0.01 to 1.0, or iii) comprises an N-vinyl amide component and is characterized by a bonding factor, X, of 0.01 to 1.0, wherein X is calculated using Equation I:
X=SE /( M* 100) ( I )
wherein M is in units of megapascal (MPa), and SE is in units of millinewton per meter (mN/m).
2 . The contact lens of claim 1 , wherein the hydrogel lens body is characterized by a bonding factor, X, of 0.01 to 1.0.
3 . The contact lens of claim 1 , wherein the hydrogel lens body comprises an N-vinyl amide component.
4 . The contact lens of claim 1 , wherein the hydrogel is a silicone hydrogel.
5 . The contact lens of claim 1 , wherein the hydrogel lens body has a percent swell of at least 5% to about 30%.
6 . The contact lens of claim 1 , wherein the hydrogel lens body has an equilibrium water content of about 10% to about 50%.
7 . The contact lens claim 1 , wherein the modulus (M) of the hydrogel lens body is at least 0.5 MPa.
8 . The contact lens of claim 1 , wherein the surface energy (SE) of the non-expandable object is less than 40 mN/m.
9 . The contact lens of claim 1 , wherein X in Formula I is less than 0.75.
10 . The contact lens of claim 1 , wherein the non-expandable object has a surface area of at least 5 mm 2 .
11 . The contact lens of claim 1 , wherein the non-expandable object comprises at least one electronic component.
12 . The contact lens of claim 1 , wherein the non-expandable object comprises a surface coating.
13 . The contact lens of claim 12 , wherein the surface coating is selected from polyimide, polydimethylsiloxane, and parylene.
14 . The contact lens of claim 1 , wherein the non-expandable object comprises a lens.
15 . The contact lens of claim 1 , wherein the non-expandable object is located in a cavity within the hydrogel lens body.
16 . A method of manufacturing a contact lens, said method comprising:
a. contacting a non-expandable object having a surface energy (SE) with a polymerizable hydrogel composition;
b. curing the polymerizable hydrogel composition and forming a hydrogel lens body having a modulus (M) with the non-expandable object embedded within the hydrogel lens body; and
c. washing the hydrogel lens body with a washing liquid to form a contact lens comprising a hydrated hydrogel lens body and a non-expandable object embedded within the washed hydrogel lens body,
wherein the hydrogel lens body i) comprises an N-vinyl amide component, or ii) is characterized by a bonding factor, X, of 0.01 to 1.0, or iii) comprises an N-vinyl amide component and is characterized by a bonding factor, X, of 0.01 to 1.0, wherein X is calculated using Equation I:
X=SE /( M* 100) ( I )
wherein M is in units of megapascal (MPa), and SE is in units of millinewton per meter (mN/m).
17 . The method of claim 16 , wherein the hydrogel lens body comprises an N-vinyl amide component.
18 . The method of claim 16 , wherein the hydrogel lens body is characterized by a bonding factor, X, of 0.01 to 1.0.
19 . The method of claim 16 , wherein the hydrogel is a silicone hydrogel.
20 . The method of claim 16 , wherein the hydrogel lens body is formed by cast molding.
21 . The method of claim 16 , wherein the hydrogel lens body is formed by lathing.
22 . The method of claim 16 , wherein the hydrogel lens body has a percent swell of at least 5% to about 30%.
23 . The method of claim 16 , wherein the washing liquid comprises an organic solvent.
24 . The method of claim 16 , wherein the hydrogel lens body has an equilibrium water content of about 10% to about 50%.
25 . The method of claim 16 , wherein the polymerizable hydrogel composition comprises N-vinyl-N-methyl acetamide (VMA), or N-vinyl pyrrolidone (NVP), or N-vinyl formamide, or N-vinyl acetamide, or N-vinyl-N-ethyl acetamide, or N-vinyl isopropylamide, or N-vinyl caprolactam, or N-vinyl-N-ethyl formamide, or any combination thereof.
26 . The method of claim 25 , wherein the polymerizable hydrogel composition comprises from about 25 wt. % up to about 75 wt. % of VMA or NVP, or a combination thereof.
27 . The method of claim 16 , wherein during the washing step a space forms between the non-expandable object and the hydrogel lens body such that the non-expandable object is located in a cavity within the hydrogel lens body.