Ophthalmic lenses with enhanced surface and methods of fabrication thereof
View Patent ↗An ophthalmic lens for providing enhanced vision includes a finished optic comprising a base optic and a membrane. The base optic has an anterior surface and an opposing posterior surface, at least one of the surfaces having a first value of a surface quality parameter. The base optic also includes a membrane including an inner surface and an outer surface, the inner surface covering one or more of the surfaces of the base optic. The outer surface has a second value of the surface quality parameter, wherein the second value is greater than the first value.
1. A method of making an intraocular lens, comprising:
forming a support structure;
forming, using a first mold, a base optic having an anterior surface and an opposing posterior surface;
processing the base optic to change a physical characteristic of the base optic, wherein the base optic is spherical;
subsequent to processing the base optic, placing the base optic in a second mold and forming, using the second mold, a membrane, the membrane being affixed to at least one of the surfaces of the base optic, thereby fabricating a finished optic, wherein the membrane includes an outer surface that defines a plurality of echelettes of a diffractive grating, and further wherein the membrane and the spherical base optic together, provision an aspheric optic.
2. The method of claim 1 , further comprising processing the finished optic.
3. The method of claim 2 , wherein processing the base optic and processing the finished optic comprises extracting impurities from the intraocular lens.
4. The method of claim 3 , wherein extracting impurities comprises performing a Soxhlet extraction.
5. The method of claim 1 , further comprising affixing the membrane to the anterior surface of the base optic and another membrane to the posterior surface of the base optic.
6. The method of claim 1 , wherein forming the base optic includes forming the base optic about a protruding portion of the support structure.
7. The method of claim 1 , wherein the membrane has a thickness that is less than or equal to 0.10 millimeters.
8. The method of claim 1 further comprising processing the finished optic including removing a contaminant from the membrane.
9. The method of claim 1 , wherein the first mold has a first central thickness and the second mold has a second central thickness, and wherein the first central thickness and the second central thickness differ from each other.