Variation of transverse chromatic aberration with displacement of artificial stop and eccentricity based on individual eye model
Variation of transverse chromatic aberration with displacement of artificial stop and eccentricity based on individual eye model
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基于单眼模型的横向色差随人工光阑位移和偏心率的变化
DOI：
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发表时间：
2010
影响因子：
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通讯作者：
Zuo T.
中科院分区：
文献类型：
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作者：
Wang Z.-Q.;Zhang M.;Wang Y.;Zuo T.
为了研究人眼横向色差（Transverse Chromatic Aberration，TCA）随人工针孔偏离视轴、偏心等外界因素的变化规律，构建了人眼模型，研究了TCA的特性。从八只眼睛的角膜数据计算视轴和光轴之间的角度。根据角膜表面、光轴长度、波前像差和计算得到的角度的测量值，利用ZEMAX软件构建了包含视轴与光轴夹角的个体眼模型。然后使用所构建的眼睛模型来研究在420 nm到700 nm的光谱范围内，在中心凹处的TCA随着人工针孔从视轴的位移的变化，并分析TCA随着偏心率的变化。结果表明，三尖瓣环距随位移呈线性增加，平均增加率为5.7（'）/mm，但在5.46（'）/mm ~ 5.95（'）/mm范围内，8只眼睛的三尖瓣环距存在一定差异。在鼻侧和颞侧20°视野内，在0.32（′）/（°）~ 0.44（′）/（°）的范围内，8只眼的TCA随偏心率的增加而增加，平均比值为0.36′/（°）。TCA在长波长端的变化比短波长端的变化慢。因此，在视网膜成像系统和现代头戴式显示系统的设计中应考虑TCA的影响。
In order to study the variation of Transverse Chromatic Aberration (TCA) with external factors,such as the displacement of artificial pinhole from the visual axis and eccentricity,this paper constructs individual eye models to investigate the characteristic of TCA. The angle between visual axis and optical axis is calculated from the cornea data for eight eyes. According to the measurements of the corneal surfaces,optical axis lengths,wavefront aberrations and the angle obtained from calculation,the individual eye models involving the angle between visual axis and optical axis are constructed with ZEMAX software. The constructed eye models are then used to investigate the variations of TCA at the fovea with the displacement of artificial pinhole from the visual axis and to analyze the variation of TCA with the eccentricity over spectra from 420 nm to 700 nm. The result shows that the TCA increases with the displacement linearly at an average ratio of 5.7(′)/mm,but there are some differences among the eight eyes over the range from 5.46(′)/mm to 5.95(′)/mm. Across the field of view of 20° both at nasal and temporal,the TCA increases with the eccentricity at an average ratio of 0.36′/(°) for the eight eyes over the range from 0.32(′)/(°) to 0.44(′)/(°).Furthermore,the variation of TCA is slower at the end of long wavelength than that at the end of short wavelength. It is concluded that the influence of TCA should be considered in the designs of retina imaging systems and modern head-mounted display systems.