The Design and Use of a New Near‐Vision Chart
The Design and Use of a New Near‐Vision Chart
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DOI：
10.1097/00006324-198006000-00011
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发表时间：
1980-06
影响因子：
1.4
通讯作者：
I. Bailey;J. Lovie
中科院分区：
文献类型：
--
作者：
I. Bailey;J. Lovie
摘要本文描述了一种新的近视图的设计，该近视图使用以对数级数排列的不相关单词，并通过控制字体、间距和每行单词的数量以及使每组单词的难度大致相等来标准化测试任务。这些视力表为系统评估阅读敏锐度和阅读的视觉效率提供了特殊优势。这些图表上印刷尺寸的对数级数可用于促进预测由光学参数变化引起的视觉性能变化的幅度，以及实现期望水平的视觉性能所需的光学参数变化的幅度。还描述了从点大小缩放转换为M单位或Snellen等效单位的简单方法。
Abstract This paper describes the design of a new near‐vision chart that uses unrelated words arranged in a logarithmic progression of size and that has standardized the test task by controlling typeface, spacings, and number of words per row, and making each group of words of approximately equal difficulty. These charts offer special advantages for systematic assessment of reading acuity and visual efficiency for reading. The logarithmic progression of print size on these charts can be used to facilitate prediction of the magnitude of changes in visual performance resulting from changes in optical parameters, and the magnitude of changes in optical parameters required to achieve desired levels of visual performance. Simple methods for converting from point size scaling to M units or Snellen equivalents are also described.