System and method for the measurement of vestibulo-ocular reflex to improve human performance in an occupational environment

A portable eye reflex measuring device for use in an ambulatory occupational environment is disclosed. The eye reflex measuring device compares data from an eye movement detector with data from a head movement detector at a frequency or frequencies in the range of 0.01 Hertz to 15 Hertz to determine eye response to head movement. The gain and phase of the eye response is calculated using a Fourier transform. The device includes a central processing unit for receiving the eye movement data, for receiving the head movement data, and for calculating the Fourier transform. Typical human physiological conditions that can be measured can include vestibulo-ocular reflex, dynamic visual acuity, dynamic visual stability, or retinal image stability.