1.   Another approach to ocular drug delivery is to insert a solid polymer device beneath the lid.

2.   Under these conditions, however, ethylene forms short chains or rings, rather than the long chains of the solid polymer.

3.   A solid polymer forms the electrolyte -- that is, the material through which charged particles migrate to create an electric current.

4.   When they removed the solvent, a small pellet of solid polymer remained, with the drug trapped inside.