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the risk of entering a vortex ring state (VRS). VRS, also designated “settling with insufficient power”, is an aerodynamic condition that results in a sudden loss of lift. Go-fast following may become even more challenging in foggy conditions because it is more difficult to estimate the helicopter’s attitude relative to the horizon and its altitude above sea level. The primary goal of the current simulator study was to quantitatively assess the effects of DVE on flight performance and workload of helicopter pilots. We hypothesize that pilots experience higher

parabolic flight studies 8 suggest that this initial pressure spike results from abrupt choroidal expansion within a rigid globe caused by a microgravity-induced venous stasis that inhibits the normal terrestrial gravity-dependent vortex venous drainage from the highly vascular choroid. The continued, sustained IOP increase during the first days of flight 2 may result from choroidal expansion, increased episcleral venous pressure, orbital pressure on the globe, or a combination of these mechanisms. This increased IOP gradually returns to normal during LDSF possibly