Complex sentence: One of the most common cause of corneal neovascularization is contact lens wear, especially those made with older hydrogel contact lens materials such as HEMA (2-hydroxyethyl methacrylate) for both daily and extended wear.
Split into simpler sentences: One of the most common causes of corneal neovascularization is contact lens wear. This is especially true of lenses made with older hydrogel materials such as HEMA (2-hydroxyethyl methacrylate) for both daily and extended wear.