Compositions, and methods of using such compositions, useful for injection into the posterior segments of human or animal eyes are provided. The fixing member includes a base material, and a surface layer material disposed on the surface of the base material, and the surface layer material contains fluorine rubber having a polymerization degree base on vinylidene fluoride. The first transistor transforms the detection result for generating a current signal. The venue-centric social networking service may track which subscribers are at which venues and provide a \u201cWho’s here\u201d listing to other subscribers.