What is HEMA primarily known for in the context of contact lenses?

HEMA, or 2-hydroxyethyl methacrylate, is primarily recognized in the context of contact lenses for its ability to absorb water, making it a hydrophilic material. This characteristic allows HEMA-based contact lenses to maintain moisture, improving comfort for the wearer. The water content of lenses made from HEMA significantly impacts their oxygen permeability and overall performance in the eye.

While it is true that HEMA is mainly utilized in soft contact lenses, which require a certain degree of hydration for optimal wear, its properties make it particularly suitable for these applications. The use of HEMA has become a standard in the manufacturing of soft lenses, and its development has played a crucial role in the evolution of contact lens materials to enhance wearer comfort and safety.