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.

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Abstract. This paper presents the results of an experiment conducted with nine blind subjects for the evaluation of two audio restitution methods for headings, using Text-To-Speech. We used specialized audio and two voices to demarcate headings. This work is part of a research project which focuses on structural information accessibility for the blind in digital documents.

This paper presents a framework which aims at describing text formatting, based on a model coming from the field of logic and linguistics, the Textual Architecture Model [23]. The goal is to improve documents accessibility for blind users. The project will later focus on evaluating the efficiency of different navigation and content presentation strategies, based on this framework.

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