Comparison of Simultaneous Measurement of Lens Accommodation and Convergence in Stereoscopic Target with Sine Curve Movement

Recently, many advances have been made in 3D technology. However, the influence of stereoscopic vision on human sight remains insufficiently understood. "Accommodation convergence discrepancy theory" states that when a person views stereoscopic images, a visual discrepancy occurs because convergence focuses at the position of the virtual object, while lens accommodation is fixed on the screen. It is widely accepted in the field that this is the main reason for visual fatigue caused while viewing 3D images. However, we have not found such a mismatch in experiments with young subjects. The aim in this study was to compare the fixation distance of accommodation and convergence in viewing real objects and 3D video clips. We measured accommodation and convergence in subjects who watched both real objects and 3D video clips with similar movements. From the result of this experiment, we found that no discrepancy exists in viewing either 3D video clips or real objects. We argue that the symptoms that occur when viewing stereoscopic vision may not be due to a discrepancy between lens accommodation and convergence. To compare the accommodative response and amplitude in different age groups, we fit the experimental results to the operation of a sine curve. Keywordsaccommodation; convergence; simultaneous measurement; stereoscopic vision; depth of field; sine curve fitting

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