Individual objective and subjective fixation disparity in near vision

Binocular vision refers to the integration of images in the two eyes for improved visual performance and depth perception. One aspect of binocular vision is the fixation disparity, which is a suboptimal condition in individuals with respect to binocular eye movement control and subsequent neural processing. The objective fixation disparity refers to the vergence angle between the visual axes, which is measured with eye trackers. Subjective fixation disparity is tested with two monocular nonius lines which indicate the physical nonius separation required for perceived alignment. Subjective and objective fixation disparity represent the different physiological mechanisms of motor and sensory fusion, but the precise relation between these two is still unclear. This study measures both types of fixation disparity at viewing distances of 40, 30, and 24 cm while observers fixated a central stationary fusion target. 20 young adult subjects with normal binocular vision were tested repeatedly to...

双眼视觉（Binocular Vision）指的是将双眼接收的图像进行整合，以提升视觉表现与深度知觉能力。双眼视觉的一个特征为注视差异（Fixation Disparity），即个体在双眼眼球运动控制及后续神经加工过程中出现的一种非最优状态。客观注视差异指的是视轴之间的辐辏角，该指标可通过眼动仪（Eye Tracker）进行测量。主观注视差异则通过两条单眼努涅斯线（Nonius Lines）进行测试，该线条可指示出感知对齐所需的实际努涅斯间距。主观与客观注视差异分别对应运动融合与感觉融合的不同生理机制，但二者之间的确切关联目前仍不明确。本研究在观察者注视中央静止融合目标的状态下，于40cm、30cm及24cm三种视距下对两种注视差异进行测量。招募了20名具备正常双眼视觉的青年成年人作为被试，并对其进行重复测试……