Infinite refractive index gradient (IRIG) polymers for ocular implant and contact lens applications
Infinite gradient refractive index ophthalmic devices and methods of making same. The method involves diffusing a monomer which polymerizes to a lower or higher corresponding opposite refractive index polymer into a lower or higher index polymer structure and polymerizing same to create the gradient structure. The resulting polymeric structure is used to manufacture ophthalmic devices, e.g., intraocular lenses.
1. A method for making an infinite refractive index gradient (IRIG) ophthalmic device having an edge and a center and a refractive index which decreases or increases infinitesimally forming a continuum of refractive index values from ophthalmic device edge to center, the method comprising the steps of:
providing an at least partially polymerized polymer rod having a first refractive index, the rod being formable into an ophthalmic device;
suspending the rod in an ophthalmic device monomer having a second refractive index when polymerized, the monomer permeating into the rod from the exterior to the interior to provide a gradient;
reacting the monomer with the polymer of the rod to create a rod-like structure with an infinite refractive index gradient; and
forming the rod-like structure into an IRIG ophthalmic device.
2. An infinite refractive index intraocular lens (IOL), the IOL having a refractive index decreasing from the center of the lens to its edge wherein the IOL is obtained by the method of claim 1 .
3. An infinite refractive index IOL, the IOL having a refractive index increasing form the center of the lens to its edge wherein the IOL is obtained by the method of claim 1 .