Age differences in Vistech near contrast sensitivity.

C T Scialfa, R A Tyrrell, P M Garvey, L M Deering, H W Leibowitz, C C Goebel
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引用次数: 24

Abstract

Contrast sensitivity was measured at near using the Vistech 6000 Contrast Test System (VCTS) in 287 persons aged 4 to 87 years. Obtained data compared well with those previously reported for the Vistech charts. Results indicate an age-related loss in sensitivity to intermediate and higher spatial frequencies. This is consistent with the age trends observed using other methods for measuring contrast sensitivity functions (CSFs). However, the Vistech charts yield contrast sensitivity values which are lower than those obtained previously with the Nicolet system. These between-method differences are greatest at lower spatial frequencies, and are attributed to the small number of grating cycles in the Vistech charts. The data are used to develop provisional age norms for the Vistech charts which allow the assessment of an individual's performance relative to their age cohort. Recommendations for use and future development of the Vistech charts are also given.

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Vistech近对比敏感度的年龄差异。
使用Vistech 6000对比测试系统(VCTS)对287名年龄在4至87岁之间的人进行了近距离对比灵敏度测试。获得的数据与先前报道的Vistech图表相比较。结果表明,对中高空间频率的敏感性与年龄有关。这与使用其他测量对比敏感度函数(csf)的方法观察到的年龄趋势一致。然而,Vistech图表产生的对比灵敏度值比以前用尼科莱系统获得的要低。这些方法之间的差异在较低的空间频率下最大,并且归因于Vistech图中光栅周期的数量较少。这些数据被用来为Vistech图表制定临时年龄标准,该图表允许评估个人相对于其年龄群的表现。文中还对Vistech图表的使用和未来发展提出了建议。
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Age differences in Vistech near contrast sensitivity. Quantitative photorefraction using an off-center flash source. The International Optometric and Optical League. Undercorrection and myopia development. Optometry and science.
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