Methods and apparatus for ophthalmic devices including cycloidally oriented liquid crystal layers
This invention discloses methods and apparatus for providing a variable optic insert into an ophthalmic lens. A liquid crystal layer may be used to provide a variable optic function and in some examples, an alignment layer for the liquid crystal layer may be patterned in a cycloidally dependent manner. The patterning may allow for a polarization dependent lens in some examples. An energy source is capable of powering the variable optic insert included within the ophthalmic lens. In some examples, an ophthalmic lens is cast-molded from a silicone hydrogel. The various ophthalmic lens entities may include electroactive liquid crystal layers to electrically control optical characteristics.
1. A contact lens device with a variable optic insert positioned within at least a portion of an optical zone of the contact lens device, wherein the variable optic insert comprises:
a curved first front surface and a curved first back surface wherein the first front surface and the first back surface are configured to bound at least a portion of a first chamber;
a curved second front surface and a curved second back surface wherein the second front surface and the second back surface are configured to bound at least a portion of a second chamber;
a layer containing liquid crystal material positioned within the at least one chamber, wherein the layer includes regions of liquid crystal material aligned in a pattern across at least a first portion of the variable optic insert that varies with a cycloidal pattern, wherein locations of orientations in liquid crystal orientation aligning with a radial axis across at least a first portion of the optic insert has a parabolic dependence on a radial dimension; and
an energy source embedded in the insert in at least a region comprising a non-optical zone.
2. The contact lens device of claim 1 wherein the layer containing liquid crystal material that varies with the cycloidal pattern assumes a curved shape.
3. The contact lens device of claim 2 wherein the lens includes a polarizing component.
4. The contact lens device of claim 2 further comprising:
a first layer of electrode material proximate to the first curved back surface; and
a second layer of electrode material proximate to the curved first front surface.
5. The contact lens device of claim 4 wherein the layer containing liquid crystal material varies its index of refraction affecting a ray of light traversing the layer containing liquid crystal material when an electric potential is applied across the first layer of electrode material and the second layer of electrode material.
6. The contact lens device of claim 5 wherein the variable optic insert alters a focal characteristic of the lens.
7. The contact lens device of claim 6 further comprising an electrical circuit, wherein the electrical circuit controls a flow of electrical energy from the energy source to the first and second electrode layers.
8. The contact lens device of claim 7 wherein the electrical circuit comprises a processor.