<prompt> Gas used in retinal temponade-SF6Ethylene oxideNitrous oxideCO2  <response>: SF6 Pars plana vitrectomy PPV with gas tamponade is widely popular for the treatment of rhegmatogenous retinal detachment . Four different intraocular gases are commonly used in vitreoretinal surgery: air, sulfur hexafluoride SF6, perfluoroethane C2F6 and perfluoropropane C3F8. Indications for tamponades- To drain subretinal hemorrhagesfluid To provide internal tamponade of retinal breaks in postoperative cases 