Abstract
Purpose To evaluate visual fatigue on viewing stereoscopic TV, which is expected to become the future broadcasting display system. Its wide public acceptance awaits the solution of many issues including visual fatigue on viewing TV images. Methods This study assesses visual fatigue associated with stereoscopic TV viewing and compares it with conventional two-dimensional TV. We measured viewers' fusional amplitude and the interaction between vergence and the accommodation system (i.e. AC/A ratio) after approximately 1-hour of viewing conventional two-dimensional TV and stereoscopic viewing three-dimensional (3D) TV, and assessed subjective visual fatigue, changes in fusional amplitude and AC/A ratio. Results Stereoscopic viewing 3D TV causes more serious subjective visual fatigue than viewing conventional two-dimensional TV. Fusional amplitude also showed more transient decrease in stereoscopic viewing than in viewing conventional TV. Decreased fusional amplitude, after viewing of stereoscopic images, recovered to pre-viewing levels after taking a short relaxation pause. AC/A ratio showed no significant change in both viewing. Conclusions Stereoscopic viewing 3D TV causes more serious subjective visual fatigue than viewing conventional two-dimensional TV. It was shown that fusional amplitude can be utilized as an objective index of visual fatigue.
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