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Shoji Yamamoto, Kyosuke Takahashi, Toshiya Nakaguchi, Norimichi Tsumura; Evaluation of the Relationship between Fusional Range and Visual Fatigue. Journal of Vision 2011;11(15):64. https://doi.org/10.1167/11.15.64.
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© ARVO (1962-2015); The Authors (2016-present)
We verified the relative contribution to visual fatigue of misalignment executed as crosstalk and vertical shift by using binocular stereoscopic display. Our investigations were executed with two cases by objective and subjective evaluation. The objective evaluation by double images recognition method can reveal the range of fusional area. The subjective evaluation by simulator sickness questionnaire (SSQ) can clarify the influence quantity as visual fatigue. When the 3D demonstration as the still image was performed with misalignment, the range of fusional area decreased according to the increase of misalignment. On the other hand, SSQ score for visual fatigue increased in proportion to the amount of misalignment. A further experiment was conducted to the motion images. As the result of this experiment, the total score of SSQ dramatically indicated higher value for visual fatigue than the case of still image. From the relationship between the fusional area and SSQ score, it is suggested that the fusion area is almost lost at the observation of motion image. We ensure that the accommodation is hardly done in motion image, since it is well known that the response of accommodation is relatively slow in comparison to the response of convergence.
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