The dynamic visual acuity test (DVAT) is a functional evaluation tool for the impairment and compensation of the vestibular system, which could reflect the Vestibulo-ocular reflex (VOR) function. We present an overview of DVAT research, displaying recent advances in test methods, application, and influencing factors; and discussing the clinical value of DVAT to provide a reference for clinical application.

Positional nystagmus can be related to various kinds of disorders. The current study aims to compare the direction-changing horizontal positional nystagmus (DCPN) characteristics in horizontal canal canalolithiasis (HC-canalolithiasis), heavy cupula of the horizontal canal (HC-Hcu), and light cupula of the horizontal canal (HC-Lcu), especially the temporal patterns of positional nystagmus in three disorders.