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Dynamic point shifting with null screens using three LCDs as targets for corneal topography

机译:使用三个LCD作为角膜地形图目标的零屏幕动态点移动

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摘要

In this paper, the use of three liquid crystal displays (LCDs) as targets for an experimental corneal topographer is proposed. The main advantage is that the geometrical pattern in the target can be modified without moving any mechanical part to apply the dynamic point shifting (DyPoS) method. Some results on the capabilities of the LCDs, obtained with photo frames, for measuring a 6.37 mm radius of curvature calibration sphere, and applying the DyPoS method, are presented. It is shown that the error in measuring the radius of curvature with DyPoS is reduced to 3% of the real value and the RMS in elevation or sagitta differences is around 15 mu m, 30% or 66% of the values obtained without DyPoS, respectively. (C) 2015 Optical Society of America
机译:在本文中,提出了使用三个液晶显示器(LCD)作为实验性角膜地形图仪的目标。主要优点是可以修改目标中的几何图案,而无需移动任何机械零件即可应用动态点位移(DyPoS)方法。提出了一些通过相框获得的LCD功能的一些结果,这些功能用于测量6.37 mm曲率半径校准球并应用DyPoS方法。结果表明,用DyPoS测量曲率半径的误差降低到实际值的3%,并且高程或矢状差的RMS分别约为没有DyPoS时获得的值的15μm,30%或66%。 。 (C)2015年美国眼镜学会

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