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Accuracy analysis in laser keratopography

机译:激光角膜地形图的准确性分析

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We analyze the accuracy of a laser keratopographer in the evaluation of corneal topography for nonsmooth corneal surfaces and when some noise is introduced into measured data. Through some numerical simulations, cosinesoidal deformations with different amplitudes and spatial periods are introduced on theoretical surfaces. Gaussian noise is introduced on the simulated x and y position coordinates for the measured position of the reflected beam in order to simulate detection errors that are due to vibrations or electric and other noise on the position-sensing detector. We found that the topography of the surface could be obtained with reliable accuracy if the height-to-width ratio of the deformations of the surface is smaller than 0.02 and the error in the detection of position at the position-sensing detector is under 0.5 mm. (C) 2002 Optical Society of America. [References: 12]
机译:我们分析了激光角膜地形图专家在评估非光滑角膜表面的角膜地形图以及将一些噪声引入测量数据时的准确性。通过一些数值模拟,在理论表面上引入了具有不同幅度和空间周期的余弦形变形。在模拟的x和y位置坐标上为反射光束的测量位置引入了高斯噪声,以便模拟由于位置感应检测器上的振动或电噪声和其他噪声而导致的检测误差。我们发现,如果表面变形的高宽比小于0.02,并且位置感应检测器的位置检测误差小于0.5 mm,则可以可靠地获得表面的形貌。 。 (C)2002年美国眼镜学会。 [参考:12]

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