What is "polymacon"

Polymacon is a non-proprietary (i.e., generic) term for a hydrophilic polymer of 2- hydroxyethylmethacrylate (HEMA) cross-linked with ethylene glycol dimethacrylate (62%) and water (38%). It is used in the manufacture of soft contact lenses, and is considered a low hydration hydrogel of nonionic polymer.