Binocular accommodative response with extended depth of focus under controlled convergences.
Binocular accommodative response with extended depth of focus under controlled convergences.
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DOI：
10.1167/jov.21.8.21
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发表时间：
2021-08-02
影响因子：
1.8
通讯作者：
Yoon G
中科院分区：
文献类型：
--
作者：
Lyu J;Ng CJ;Bang SP;Yoon G
在虚拟现实观看条件下，聚散和调节可能不匹配，并且这种不匹配被认为是视觉不适的主要原因之一。本研究的目的是探讨眼睛的光学条件如何影响对不同会聚的分辨反应。具体而言，我们假设，延长焦深（DoF）可以削弱屏幕对调节的控制，从而通过会聚来诱导调节。为了验证这一假设，我们扩展了自由度使用泽尼克球面像差（第四和第六阶）引起的双目自适应光学（AO）视觉模拟器。研究对象为9名正常人，年龄21 ~ 34（26 ± 5）岁。产生三种光学条件：AO条件（无像差）、单视条件和扩展焦深（EDoF）条件。在所有三种光学条件下，在不同的双眼聚散度水平下，测量双眼视敏度和立体视敏度的沿着反应。在3屈光度的双眼会聚，EDOF条件是最有效的诱导过度反射反应相比，单眼条件和AO条件。与其他两种情况相比，EDOF的视力受损。EDoF条件下的平均立体阈值（在0聚散度）与AO条件相比有所下降，但上级优于单视条件。因此，尽管对视觉性能有一些妥协，但延长DoF可以允许更自然的聚散度-调节关系，从而提供缓解虚拟现实中聚散度-调节冲突和相关视觉疲劳症状的潜力。
Vergence and accommodation can be mismatched under virtual reality viewing conditions, and this mismatch has been thought to be one of the main causes of visual discomfort. The goal of this study was to investigate how optical conditions of the eyes affect accommodative responses to different convergence. Specifically, we hypothesized that extending the depth of focus (DoF) could weaken the control of the screen on accommodation, so that accommodation could be induced by convergence. To test this hypothesis, we extended the DoF using Zernike spherical aberrations (fourth and sixth orders) induced by a binocular adaptive optics (AO) vision simulator. Nine normal subjects between the ages of 21 and 34 (26 ± 5) years were recruited. Three optical conditions were generated: AO condition (aberration-free), monovision condition, and extended depth of focus (EDoF) condition. Binocular accommodative responses, along with binocular visual acuity and stereoacuity, were measured under all three optical conditions with varied binocular vergence levels. At 3 diopters of binocular convergence, the EDoF condition was the most efficient in inducing excessive accommodative response compared with the monovision condition and the AO condition. Visual acuity was impaired with EDoF as compared with the other two conditions. The average stereoscopic thresholds (at 0 vergence) under the EDoF condition were degraded compared with the AO condition but were superior to those of the monovision condition. Therefore, despite some compromise to visual performance, extending the DoF could allow for a more natural vergence–accommodation relationship, providing the potential for alleviating the vergence–accommodation conflict and associated visual fatigue symptoms in virtual reality.
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