Ophthalmic devices for delivery of beneficial agents

1. A method of manufacturing a contact lens, said method comprising:

a) polymerizing a monomer mixture comprising 2-methacryloyloxyethyl phosphorylcholine (MPC) to provide an non-hydrated lens-shaped polymerization product;

b) immersing the non-hydrated lens-shaped polymerization product in a package containing a packaging solution comprising an ionic agent; and

c) sealing the package, wherein the ionic agent electrostatically attaches to phosphorylcholine groups on the MPC.

2. The method of claim 1 , wherein the monomer mixture comprises 10 wt. % to 20 wt. % MPC.

3. The method of claim 1 , wherein the ionic agent is polyionic or comprises at least one guanidinium group or is both polyionic and comprises at least one guanidinium group.

4. The method of claim 1 , wherein the ionic agent is cationic.

5. The method of claim 1 , wherein the ionic agent is anionic.

6. The method of claim 1 , wherein the ionic agent is polyquaternium-55.

7. The method of claim 1 , further comprising:

d) autoclaving the sealed package.

8. A method of administering an ionic agent to ocular tissue of a patient in need thereof, said method comprising administering the patient an unworn contact lens immersed in a packaging solution and sealed in a package, said contact lens comprising:

(a) a hydrogel comprising integral phosphorylcholine groups; and

(b) a releasable ionic agent electrostatically bound to the phosphorylcholine groups, wherein the ionic agent is polyionic or comprises at least one guanidinium group or is both polyionic and comprises least one guanidinium group.

9. The method of claim 8 , further comprising storing the contact lens after it has been worn by the patient overnight in a storage solution comprising additional ionic agent which electrostatically binds to the phosphorylcholine groups thereby replenishing ionic agent released during the previous wear by the patient.