This article proposes an advanced theoretical framework that quantitatively evaluates dispersion state of silica beads of a PET-based antiglare film. The positional randomness of bead dispersion is expressed via a single scalar value, the dynamic dispersity index. The static dispersity index definition based on molecular dynamics, which was proposed in our previous work, was improved with a pseudo-relaxation algorithm. PET-based antiglare films, which had the variable degree of particle dispersion, were used for the verification together with graphically drawn artificial bead images. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013