WE PROPOSE A SIMPLE AND RAPID MEASURE OF OTOLITH ASYMMETRY - A BASIC LOW-LEVEL NEUROVESTIBULAR FUNCTION THAT IS ALTERED IN SPACE FLIGHT. OUR ASSESSMENT APPARATUS AND PROCEDURE WAS DEVELOPED WITH PREVIOUS HRP SUPPORT AND HAS UNDERGONE VALIDATION TESTING AND IS CURRENTLY IN USE IN AN UNRELATED DOD STUDY. IT PROVIDES A MEASURE OF BINOCULAR ALIGNMENT (VERTICAL AND TORSIONAL) WHICH IS A REFLECTION OF UNDERLYING OTOLITH ASYMMETRY. WHILE THIS MEASURE MIGHT BE IMPORTANT IN ITSELF (SINCE IT REFLECTS A FORM OF CENTRAL NEURAL COMPENSATION THAT MIGHT BE CHALLENGED IN SPACE FLIGHT) IT COULD ALSO PROVIDE A SIMPLE ALTERNATIVE TO LOCOMOTION AND POSTURE TESTING IF IT IS FOUND TO CORRELATE WITH THOSE MEASURES.