Accommodating lens with cavity
A lens comprises an internal cavity structure formed by dissolution of a soluble insert material. The internal soluble material may dissolve through a body of a lens such as a contact lens in order to form the cavity within the contact lens. The cavity within the lens can be shaped in many ways, and corresponds to the shape of the dissolved material, such that many internal cavity shapes can be readily fabricated within the contact lens. The insert can be placed in a mold with a pre-polymer material, and the pre-polymer material cured with the insert placed in the mold to form the lens body. The polymerized polymer may comprise a low expansion polymer in order to inhibit expansion of the lens when hydrated. The polymer may comprise a hydrogel when hydrated. The soft contact lens material comprises a sufficient amount of cross-linking to provide structure to the lens and shape the cavity.
1. A soft contact lens package, comprising:
a sterile package;
an aqueous fluid contained within the sterile package;
an accommodating soft contact lens comprising a contact lens body, said contact lens body comprising a hydrogel material contained within the sterile package, said contact lens body immersed in said aqueous fluid, wherein said contact lens body defines a cavity within said contact lens body, wherein said cavity comprises central optical chamber coupled to a reservoir with a channel extending therebetween to provide variable amounts of optical power when worn, wherein said cavity comprises a first eroded material comprising a first molecular weight sized to pass through channels of the contact lens body and a second eroded material comprising a second molecular weight sized to inhibit passage through the channels and create an osmotic bulge on at least a portion of the contact lens body, wherein said contact lens body is permeable to a liquid and the aqueous fluid in which the accommodating soft contact lens is immersed, and wherein at least a portion of the aqueous fluid has diffused into said cavity.
2. The soft contact lens package of claim 1 , wherein said contact lens body is permeable to water such that said contact lens hydrates an eye with the aqueous fluid from the cavity when placed on the eye.
3. The soft contact lens package of claim 1 , wherein said contact lens body comprises an index of refraction within a range from about 1.31 to about 1.37 and wherein said aqueous fluid comprises an index of refraction within a range from about 1.31 to about 1.37.
4. The soft contact lens package of claim 1 , wherein said contact lens body comprises an amount of cross-linking sufficient to inhibit bacteria entering the cavity from outside the contact lens body.
5. The soft contact lens package of claim 1 , wherein said cavity comprises an embedded cavity filled with the aqueous fluid of hydration of said lens.
6. The soft contact lens package of claim 1 , wherein said contact lens generates an addition plus power on eye upon down-gaze when viewing near objects.
7. The soft contact lens package of claim 6 , wherein a range of said add power is 0.5 D to 6.0 D.
8. The soft contact lens package of claim 6 , wherein said down-gaze is in the range of 10 degrees to 40 degrees.
9. The soft contact lens package of claim 6 , wherein a distance to said near objects is in a range from 15 cm to 200 cm.
10. The soft contact lens package of claim 6 , wherein said lens comprises a cross-linked hydrogel network formed from a photo-polymerizable pre-polymer formulation wherein said cross-linked hydrogel network has an amount of water within a range from about 28% to 65%.