查询词典 refraction

The spherical equivalence of cycloplegic auto-refraction equal or less than -0.5D in either eye is defined as myopia and that equal or higher than +2D is defined as hyperopia.

分析了学龄期儿童的纵向屈光改变情况、近视眼的发病率及其危险因素、儿童视力现状以及一些常见眼病的患病率情况。

Methods Sixty students(120 eyes)with myopia(within-2.50D)were selected.visival acuity,cycloplegic refraction,keratometer,ocular axis,stereoscopic vision,and phoria strabismus were observed before and after 1～1.5 years wearing Anti-myopia Glasses.

近视的发生和发展与环境的影响密切相关[2]，特别在青少年时期，过分的和不适当的阅读、书写、观看电脑屏幕及其他近工作，是促成近视的重要因素[3]。

METHODS: Refractive error (cycloplegic auto-refraction with subjective refinement), central corneal thickness and axial length, intraocular pressure, and corneal hysteresis (Reichert Ocular Response Analyzer) were measured on a rural school-based cohort of children.

在以一个农村地区学校为基础的队列中，对这些儿童进行屈光不正（睫状肌麻痹性自动验光和主观优化）、中央角膜厚度、眼轴长度、眼内压和角膜滞后（Reichert眼部反应分析仪）等指标的检测。

A sectional hyperbola cylinder sound lens using for oil recovery is designed according to the refraction law of sound.

对于一定的油井，无法改变油井中的原油及其岩层对超声波的衰减作用，但是，利用声透镜可以改变超声换能器所辐射出的超声

In fact, most of waveshapes of lightning intruding surges into substations are damped oscillation impulses which caused by the refraction and reflection of travelling waves.

对于雷电暂态分析与计算来说，冲击电晕对雷电波衰减和变形的作用主要由其伏库特性加以考虑。

Also,the pulse velocity of drilling fluid declined with increase of gas content.The drilling fluid pulse transmitting up and down along well bore had refraction and reflection components similar to damped oscillation at the boundary of system.

脉冲传输速度对含气量非常敏感，随着含气量的增加，传输速度迅速下降；沿井筒往复传播的钻井液脉冲在系统边界处将产生折射和反射，类似于阻尼振荡；钻井液粘度是影响脉冲信号衰减速度的一个重要因素。

Objective To evaluate the lasting time of background luminance difference of the fixation target between two eyes because of dark adaptation under routine subjective refraction.

目的 探讨在常规主觉验光环境下，暗适应造成的双眼前视标背景亮度差异的持续时间。

An optical system with refraction and total internal reflection was proposed according to the luminous characteristic of LED and the law of energy conservation. The ordinary differential equations satisfying the spots on the contour curve of TIR refractive and reflective planes were established. The coordinates of points on profile curves were obtained by solving these ordinary differential equations using Runge-Kutta method. The profile curves were acquired by curve fitting of the coordinate spots with software UG, and then TIR model of the projector and data of the surface shape suitable for NC manufacture were obtained.

根据LED的发光特性以及能量守恒定律选择采用折射全反射光学系统，通过建立TIR折射面及全反射面轮廓曲线上的点所满足的常微分方程，利用RungeKutta求解常微分方程得到轮廓曲线上点的坐标，再在UG中对坐标点进行曲线拟合得到轮廓曲线，进而得到TIR模型及适合数控加工的面形数据。

Dioptometer:an instrument used for measuring ocular refraction .

屈光计：用于测量眼睛折射度的仪器。

AIM: To compare the dioptre results obtained by wavefront analyzer and subjective refraction test, respectively, and to evaluate the accuracy and reliability of lowerorder aberrations measured by wavefront analyzer.

目的：比较波前像差仪与主观验光法对屈光度检查的结果，探讨波前像差仪对低阶像差测量的可靠性和准确性。

The teacher likes the honeymouthed little girl very much.

老师很喜欢这个嘴甜的小姑娘。

Mr. Notker Bien's interests are traveling, spending quality time with the family and long-distance-running.

诺特卡·柏恩先生热爱旅游，长跑，以及和家人一起共度美好时光。