An Attempt to Analyze the Fluctuation in Vergence Distance During 3D Video Watching

Watching 3D maze-like perspective images close to on the small screen of a smartphone can cause eye fatigue and make it difficult to look at it with both eyes. In fact, we found from the experiments in our previous study that some participants sometimes looked with "one eye" while watching. Thus, in this study, we used the vergence distance of participants who were able to continue watching with both eyes, and analyzed the fluctuation with time of the vergence distance using the mean squared displacement (MSD) and the Hurst exponent (HE). The former index, α, is an indicator characterizing the randomness in the diffusion process of the time series. The latter index, H, is an indicator that reveals the long range dependence hidden in the time series. As a result, the fluctuation in vergence distance was determined to be due to uncorrelated random motion, and it was confirmed that this may be observed as a slight tendency toward a long memory process.