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首先以Hwey-Lan Liou眼模型为基础,根据等效性原则,保持该眼模型中自然晶状体屈光度不变,对无穷远点成像。然后利用ZEMAX实现光线追迹的方法,将自然晶状体替换为可调节人工晶状体(accommodative intraocular lens,AIOL),结合对人眼成像质量影响的分析,研究了AIOL在眼内的移动度、材料、中心厚度、结构、光学面非球面性等因素对其屈光调节力的影响。结果表明:AIOL移动度对其调节力贡献最大,材料、中心厚度、结构对调节力基本无影响;具有非球面光学面的AIOL调节力相对较大。 相似文献
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弱视是一种影响要幼儿视力的功能性眼病.屈光不正是导致弱视的常见原因之一.尤其是当散光得不到及时正确的矫正时很容易造成弱视.有时散光与可能被误诊为弱视.本文采用了大量临床病历.利用数统计的理论和方法对散光性弱视患儿的弱视程度、患儿的年龄结构及患儿的眼别和性别等关系进行了定量的分析. 相似文献
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A generalized formula of hollow Gaussian beams through the first-order misaligned ABCD systems is derived by using the generalized diffraction integral formula. It is shown that the hollow Gaussian beam passing through the misaligned system becomes a decentred hollow Gaussian beam. The propagation properties of the output beam are investigated when it propagates through a simple misaligned lens system. These results provide a powerful theoretical tool for applications of optical traps. 相似文献
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据不完全统计,在我国城市中约有三分之一的人患有屈光不正.眼镜是人类应用最广泛的一种矫正屈光不正眼的医疗工具之一,它的光学原理是什么呢?本文就这一问题做如下讨论. 相似文献
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Accommodation and convergence play critical roles in the natural process of depth perception, and the field of natural three-dimensional (3D) perception in stereo displays has been extensively explored. However, no prototypes of these natural 3D displays are suitable for wear due to the system size and weight. In addition, few of the researches have involved subjects with ametropia. We propose and develop an optical see-through head-mounted display (HMD) capable of diopter adjustment of both the virtual image and the real world scene. The prototype demonstrates a diagonal field of view (NOV) of 42° and an exit pupil diameter of 9 mnl, and a diopter adjustment range of -5.5D to 0D. Depth adjustment of virtual image is demonstrated with experiments, the results show the HMD can be further used to investigate the accommodation and convergence cues in depth perception in AR environment, particularly for users with different degree of the ametropia. 相似文献
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本文从镜度仪的光学设计原理和有关各国眼镜片的基准弯度,提出作为校正和检定镜度仪精度的基准屈光值镜片之内侧面弯度为-6 D。基准值镜片接触面曲率不同,会产生原理误差。本文还提出测试基准屈光值的方法和仪器,根据眼镜片内顶点屈光度的定义,在光具座上测定顶焦距l_f′的倒数值比直接测试要正确。 相似文献