Longitudinal observation of intraocular pressure variations with acute altitude changes

Figure 1 Altitude profiles of three groups and examination time points. The low altitude (LA) group flew to 2261 m above sea level (ASL). Three days later, they flew with the high altitude (HA) group to 3750 m ASL where both groups stayed for 2 d. The LA group flew back to 2261 m ASL and stayed for 1 d before returning to 44 m. Intraocular pressure, vital values and hematological values were measured before and during exposure to 2261 m and 3750 m ASL in LA, HA, and very high altitude groups. X: Examination time points; LA: Low altitude; HA: High altitude; VHA: Very high altitude.