首页> 外文期刊>Optometry and vision science: official publication of the American Academy of Optometry >An analytical model describing aberrations in the progression corridor of progressive addition lenses.
【24h】

An analytical model describing aberrations in the progression corridor of progressive addition lenses.

机译:一种分析模型,描述渐进屈光力镜片的渐进走廊中的像差。

获取原文
获取原文并翻译 | 示例
           

摘要

PURPOSE: In the progression corridor of a typical progressive addition lens (PAL) with an addition of 2.5 D, the power changes by roughly 1/8 D/mm. This renders a power difference of some 0.5 D across a typical pupil diameter of 4 mm. Contrary to this fact, PALs do work well in the progression zone. To explain why, we apply a simple model to derive wavefront characteristics in the progression zone and compare it with recent experimental data. METHODS: We consider a simple analytic function to describe the progression zone of a PAL, which has been introduced by Alvarez and other authors. They considered the power change and astigmatism, which are second-order wavefront aberrations. We include third-order aberrations and compare them with spatially resolved wavefront data from Hartmann-Shack-sensor measurements. RESULTS: The higher-order aberrations coma and trefoil are the dominant aberrations besides astigmatism as given by experimental data. According to our model, the third-order aberrations in the transition zone are strongly coupled to the power change and the cubic power of the pupil radius. Their overall contribution according to experimental data is nicely reproduced by our model. The numeric contribution of higher-order aberrations is small and, for practical purposes, the wavefront can be described locally by the second-order components of sphere and astigmatism only. CONCLUSIONS: We propose a simple analytical model to understand the optics in the progression corridor and nearby zones of a PAL. Our model confirms that for typical pupil sizes, all higher-order aberrations, including the dominant modes of coma and trefoil, are small enough to render an undisturbed vision in the progression zone. Therefore, higher-order aberrations have a minimal impact on the optical performance of these lenses.
机译:目的:在典型的渐进屈光力镜片(PAL)加上2.5 D的渐进光道中,屈光度变化大约1/8 D / mm。这在典型的4 mm瞳孔直径上产生了约0.5 D的功率差。与这个事实相反,PAL在进展区域中表现良好。为了解释原因,我们应用了一个简单的模型来导出进展区域中的波前特征,并将其与最新的实验数据进行比较。方法:我们考虑了一个简单的分析函数来描述PAL的进展区域,该函数已由Alvarez和其他作者引入。他们考虑了功率变化和像散,它们是二阶波前像差。我们包括三阶像差,并将它们与来自Hartmann-Shack传感器测量结果的空间分辨波前数据进行比较。结果:实验数据显示,除散光外,高阶像差昏迷和三叶形是主要像差。根据我们的模型,过渡区域中的三阶像差与光瞳半径的光焦度变化和三次方变化密切相关。我们的模型很好地再现了根据实验数据得出的总体贡献。高阶像差的数值贡献很小,并且出于实际目的,只能通过球面和像散的二阶分量局部描述波前。结论:我们提出了一个简单的分析模型,以了解PAL的进展走廊和附近区域的光学特性。我们的模型证实,对于典型的瞳孔大小,所有高阶像差(包括昏迷和三叶草的主要模式)都足够小,以至于不会在进展区域产生视觉干扰。因此,高阶像差对这些透镜的光学性能影响很小。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号