Accuracy of research of Chinese elderly cataract patients with normal axial length diopter intraocular lens formula for calculating 国人正常眼轴老年白内障患者人工晶状体屈光度计算公式的准确性研究
First, with the corneal parameters which are obtained before refractive surgery, the position of effective lens is calculated by the standard SRK-T formula. And then with the optic parameters of cornea ablation zone, the power of IOL is calculated by ray tracing method. 首先利用SRK-T计算公式根据角膜屈光术前的角膜测量参数确定人工晶体的植入位置,然后利用术后的角膜切削区光学参数,通过光线追迹的方法给出所需植入人工晶体的屈光度值。
This paper expounds the theory of magnetism lens. According to the theory, the formula and geometrical optics theory, the writer finds out a way that can decide the position of magnetism lens. 阐明了磁透镜原理,依照磁透镜理论和几何光学理论,给出一种确定磁透镜位置的方法。
A discussion on the lens calculation formula of run error 关于调焦透镜运行差计算公式的讨论
Assuming an electromagnetic wave is incident on the lens surface, the field distribution in focal space of the lens is analyzed by using Stratton Chu formula and ray tracing method. It will provide much information about the imaging performance of the lens. 采用Stratton-Chu公式和射线追迹分析了电磁波入射到扩展半球透镜上时在其背面的场分布,即透镜的焦区场分布,以获得透镜用于焦面阵成像时的性能。
Numerical calculation examples are given for the focusing of cosh Gaussian beams by an aperture lens. A comparison is made, which has shown the advantage of this method and the results are in good agreement with those obtained by the straight forward integration of Collins formula. 对双曲余弦高斯光束通过有光阑限制的薄透镜聚焦系统进行了数值计算,计算结果与直接由柯林斯(Collins)公式所得结果一致,且此解析方法便于进行物理分析,可节约大量机时。
Comparison of intraocular lens power calculation formula 人工晶状体计算公式比较
The optical principle of far-focusing zooming objective lens and the method of optical combination computation are introduced. The formula of Gaussian solution is derived. 介绍远焦型变焦距物镜的光学原理及光组组合计算方法,导出了高斯解计算公式。
The lens transformation formula was made more simply and intuitionistic importing Newtonian formula to Gaussian beam transformation. 在高斯光束变换中引入牛顿公式,使透镜变换公式更加简洁、直观。
Conclusions: To the cataractous patient after refractive surgery, if the measured intraocular lens power was higher before cataract operation, the SRK formula could be used. 结论:对于近视眼屈光矫正术后的白内障病人,若白内障术前预测人工晶体度数较大时,SRK公式所计算的人工晶体度数可参考并使用;
The paper discusses the difficulty presented in deducing Fourier transform formula due to the lens aperture restriction, and analyzes the desired conditions in using the formula in great detail. 本文讨论了薄透镜孔径对透镜傅里叶变换公式导出带来的困难,较全面地分析了使用该公式应满足的条件。
Based on lens array refraction theory the formula is presented, with which the farthest observable distance between different corresponding points is calculated. 针对该显示器,根据透镜阵列折射原理给出公式,计算了不同同名点距离时最远的可观察距离;
Effect of Lens Aperture Restriction on Fourier Transform Formula And The Desired Conditions in Using The Formula 透镜孔径限制对其傅里叶变换公式导出的影响&兼论公式使用条件
And give out the unified optical path, Newton's Ring radius and convex lens curvature radius measurement formula of non-contact type, simple cutting type and tangent type Newton's Rring. 并给出了非接触式、浅近切割式及相切式牛顿环的统一的光程差,牛顿环半径及凸透镜曲率半径测量公式。
The Focusing property of flat-topped multi-Gaussian laser beam by lens with spherical aberration is discussed. on the basis of generalized Huygens-Fresnel Diffraction integral formula. 利用广义惠更斯-菲涅耳衍射积分公式,研究了平顶多高斯光束通过球差透镜的聚焦特性。
By assuming the weak lens focal length expression to be the first term in a power series, a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens. 用假设弱透镜焦距表达式是一个幂级数中的第一项的方法,可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。
Closed-form expressions for the relative intensity excess and focal shift of Hermite-Gaussian beams focused by an unaperture lens have been derived and analyzed by means of the generalized Huygens-Fresnel diffraction integral ( or called coffins formula). 借助广义惠更斯-菲涅尔衍射积分(即Coffins公式)推导出HermiteGaussian光束(H&G光束)在无光阑限制下的相对焦移和相对光强增量的解析表达式,并作了分析。
The analytical expression for the axial irradiance distribution of cosine-squared Gaussian beams passing through an astigmatic lens is derived using the Collins formula. 利用Collins公式推导出了余弦平方-高斯光束通过像散透镜聚焦后轴上光强分布的解析表达式,通过数值运算并对计算结果进行了详细分析。
Inferred by using the theory of optical structure using compensating thermal lens effect caused by the output beam of spherical aberration compensation formula, results show that this active optical element can be used for high energy laser resonant cavity compensation of thermal effect in spherical aberration effects. 通过使用光学理论推导出使用该结构补偿热透镜效应引起的输出光束球差项的补偿公式,结果表明,这种主动光学元件可以用于谐振腔内补偿高能激光器中热效应产生的球差项的影响。
Compared with Gaussian lens transformation formula, the ray-tracing method, in which the aberration of optical system is hidden in the beam transformation process, is well. 与高斯光束的理想透镜变换公式相比,光线追迹法将光学系统的像差隐含于光束的透镜变换过程中,弥补了高斯光束透镜变换公式忽略透镜像差的缺陷。
The Fresnel lens with the knowledge of geometrical optics is designed and the formula is derived. 本文应用几何光学知识对菲涅耳透镜的结构进行了详细的光学设计,推导出相关参数的计算公式。