Although fixation micro eye movements are classified into three types: 1. flicks (micro-saccades), 2. drifts, and 3. tremors according to its order of magnitude, details are unknown as to drift and tremor, due to the technical difficulties in extracting small signals from noise. One problem is that eye motion detection is contaminated by head movement to a variety of direction in three dimensional space. Here, we attempt to dissociate micro eye movement from such head motion by a novel method of fixating the head in the lying down position. Video occulograms (VOG) were recorded simultaneously as to head position (Tanaka et al. 2013) as well as the micro eye movements. Timing was controlled by the electrically triggered signals, and eye and head motion tracking were carried out independently by the SURF image tracking method. Eye and head coordinates were calculated and combined by a three dimensional affine transformation to a unified coordinate, and pure eye motion components were separated from head motion signals. Our result shows that, during the fixation task, there are head motion components with a magnitude range between 10 to 50 micro meters, whose range is equivalent to the reported tremor and drift eye movements. Furthermore, micro eye movements were separated from the head motion, found to be the magnitude by 5 to 50 micrometers. These results characterize the spatial-temporal details of miniature eye movements in its micrometer order, independent of the micro meter order of head motion.