Cast-moldable, high refractive index, rigid, gas permeable polymer formulations for an accommodating contact lens
An eye-mountable device is provided that includes a plurality of rigid polymer layers separated by liquid crystal layers. Certain eye-mountable devices includes a first rigid polymer layer, a second rigid polymer layer, and a liquid crystal layer between the first and second rigid polymer layers. The liquid crystal layer has a refractive index that is electrically controllable between an ordinary refractive index and an extraordinary refractive index, and the first rigid polymer layer and second rigid polymer layer include materials having a refractive index similar to the ordinary refractive index of the liquid crystal layer. The first rigid polymer layer and second rigid polymer layer may also include a combination of monomer-derived units that provide cast-moldable materials with high oxygen permeability. Methods for fabricating the eye-mountable device and for changing the focal length of the eye-mountable device are also provided.
1. An eye-mountable device, comprising
a first rigid polymer layer having a first-layer refractive index;
a second rigid polymer layer having a second-layer refractive index; and
a first liquid crystal layer between the first and second rigid polymer layers, wherein the first liquid crystal layer has an ordinary refractive index and an extraordinary refractive index,
wherein
the first-layer refractive index and the second-layer refractive index differ by less than 0.01,
the ordinary refractive index and the extraordinary refractive index differ by more than 0.1, and
the first-layer refractive index differs from either the ordinary refractive index or the extraordinary refractive index by less than 0.01,
the first rigid polymer layer or second rigid polymer layer comprise:
one or more di(meth)acrylate-derived monomeric unit; and
one or more (meth)acrylate-derived monomeric units, and
the first or second rigid polymer layer comprises 5 weight percent to 10 weight percent of a monomeric unit derived from Bisphenol A dimethacrylate, and 10 weight percent to 20 weight percent of a monomeric unit derived from methacryloxypropyl terminated polydimethylsiloxane 8-14 cSt.
2. The eye-mountable device of claim 1 , wherein the first-layer refractive index differs from the ordinary refractive index by less than 0.01.
3. The eye-mountable device of claim 2 , wherein the first-layer refractive index differs from the ordinary refractive index by less than 0.005.
4. The eye-mountable device of claim 2 , wherein the first-layer refractive index differs from the ordinary refractive index by less than 0.001.
5. The eye-mountable device of claim 2 , wherein the first-layer refractive index, second-layer refractive index and ordinary refractive index are between 1.40 and 1.55 measured at 589 nm.
6. The eye-mountable device of claim 2 , wherein the first-layer refractive index, second-layer refractive index and ordinary refractive index are between 1.55 and 1.80 measured at 589 nm.
7. The eye-mountable device of claim 1 , wherein the first-layer refractive index differs from the extraordinary refractive index by less than 0.01.
8. The eye-mountable device of claim 7 , wherein the first-layer refractive index differs from the extraordinary refractive index by less than 0.005.
9. The eye-mountable device of claim 7 , wherein the first-layer refractive index differs from the extraordinary refractive index by less than 0.001.
10. The eye-mountable device of claim 7 , wherein the first-layer refractive index, second-layer refractive index and extraordinary refractive index are between 1.40 and 1.55 measured at 589 nm.
11. The eye-mountable device of claim 7 , wherein the first-layer refractive index, second-layer refractive index and extraordinary refractive index are between 1.55 and 1.80 measured at 589 nm.
12. The eye-mountable device of claim 1 , wherein the first or second rigid polymer layer comprises 20 weight percent to 30 weight percent of a monomeric unit derived from 1,1,1,3,3,3-Hexafluoroisopropyl methacrylate, 7 weight percent to 12 weight percent of a monomeric unit derived from methyl methacrylate, 10 weight percent to 20 weight percent of a monomeric unit derived from 3-[Tris(trimethylsiloxy)silyl]propyl methacrylate and 27 weight percent to 33 weight percent of a monomeric unit derived from o-phenylphenol ethyl acrylate.
13. The eye-mountable device of claim 1 , wherein the first rigid polymer layer and second rigid polymer layer have a gas permeability of at least 100 Barrers.
14. The eye-mountable device of claim 1 , further comprising a third rigid polymer layer having a third-layer refractive index and a second liquid crystal layer between the second rigid polymer layer and the third rigid polymer layer, wherein
the second liquid crystal layer has an ordinary refractive index and an extraordinary refractive index,
the second-layer refractive index and the third-layer refractive index differ by less than 0.01,
the ordinary refractive index and the extraordinary refractive index of the second liquid crystal layer differ by more than 0.1, and
the first-layer refractive index differs from either the ordinary refractive index or the extraordinary refractive index of the second liquid crystal layer by less than 0.01.