EFFECTS OF EXPOSURE TO SIMULATED ALTITUDES ON VISUAL-FIELDS, CONTRASTSENSITIVITY, AND DAZZLE RECOVERY

Previous studies have shown that visual performance may be impaired at altitudes above 12,000 ft when supplementary oxygen is not used, What is not known is whether there may be subtle changes in visual functio n at altitudes to which airline cabins are usually pressurised. In thi s study, we measured spatial and temporal contrast sensitivity, centra l visual field thresholds, and macular photostress recovery time in 12 male subjects at sea level and at simulated altitudes of 7000 ft and 12,000 ft, Our results showed insignificant changes in spatial and tem poral contrast sensitivity, central visual field thresholds and dazzle recovery time with respect to simulated altitudes.