Effect of the accommodation-vergence conflict on vergence eye movements.
With the broader use of stereoscopic displays, a flurry of research activity about the accommodation-vergence conflict has emerged to highlight the implications for the human visual system. In stereoscopic displays, the introduction of binocular disparities requires the eyes to make vergence movements. In this study, we examined vergence dynamics with regard to the conflict between the stimulus-to-accommodation and the stimulus-to-vergence. In a first experiment, we evaluated the immediate effect of the conflict on vergence responses by presenting stimuli with conflicting disparity and focus on a stereoscopic display (i.e. increasing the stereoscopic demand) or by presenting stimuli with matched disparity and focus using an arrangement of displays and a beam splitter (i.e. focus and disparity specifying the same locations). We found that the dynamics of vergence responses were slower overall in the first case due to the conflict between accommodation and vergence. In a second experiment, we examined the effect of a prolonged exposure to the accommodation-vergence conflict on vergence responses, in which participants judged whether an oscillating depth pattern was in front or behind the fixation plane. An increase in peak velocity was observed, thereby suggesting that the vergence system has adapted to the stereoscopic demand. A slight increase in vergence latency was also observed, thus indicating a small decline of vergence performance. These findings offer a better understanding and document how the vergence system behaves in stereoscopic displays. We describe what stimuli in stereo-movies might produce these oculomotor effects, and discuss potential applications perspectives.
Technicolor R&D, 975 avenue des Champs Blancs, CS 17616, 35576 Cesson-Sévigné Cedex, France; Laboratoire de Psychologie de la Perception, Université Paris Descartes/CNRS, 45 rue des Saints-Pères, 75006 Paris, France. Electronic address: cyril.vienne@ymail.com.
Cyril
C
Vienne
Technicolor R&D, 975 avenue des Champs Blancs, CS 17616, 35576 Cesson-Sévigné Cedex, France. Electronic address: laurent.sorin@ensc.fr.
Laurent
L
Sorin
Technicolor R&D, 975 avenue des Champs Blancs, CS 17616, 35576 Cesson-Sévigné Cedex, France. Electronic address: laurent.blonde@technicolor.com.
Laurent
L
Blondé
Technicolor R&D, 975 avenue des Champs Blancs, CS 17616, 35576 Cesson-Sévigné Cedex, France. Electronic address: quan.huynh-thu@technicolor.com.
Quan
Q
Huynh-Thu
Laboratoire de Psychologie de la Perception, Université Paris Descartes/CNRS, 45 rue des Saints-Pères, 75006 Paris, France. Electronic address: pascal.mamassian@parisdescartes.fr.
Pascal
P
Mamassian
D000065:Accommodation, Ocular / Q000502:physiology*; D000328:Adult; D000704:Analysis of Variance; D003290:Convergence, Ocular / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010775:Photic Stimulation / Q000379:methods; D015357:Vision Disparity / Q000502:physiology; D055815:Young Adult
Accommodation-vergence conflict; Disparity; Disparity step; Focus; Vergence dynamics; Visual fatigue