Hernández C, Doménech B, Seguí M M, Illueca C
Departamento Interuniversitario de Optica EU, Alicante, Spain.
Ophthalmic Physiol Opt. 1996 Jul;16(4):336-41.
Measuring the contrast sensitivity function (CSF) is becoming more frequent in the analyses that are routinely done in optometric practice. This measurement is generally done in far vision, and the observation distance and its effects are not considered to significantly alter this function. Among these effects we should point out the accommodation of the visual optical system to the stimulus and the errors in accommodation associated with this, changes in pupil diameter and therefore in retinal illumination when the observation distance changes, the different level of aberrations (spherical aberration, astigmatism) for different cases, and so on. All of these factors contribute to the fact that the contrast sensitivity of a visual system varies according to the accommodative stimulus. In this study we attempt to clarify the influence of these different parameters by evaluating the CSF for three observation distances. The study was done in monocular vision, with a natural pupil and with a 3 mm artificial pupil that made it possible to maintain the same level of retinal illumination for all distances.
在验光实践中常规进行的分析里，测量对比敏感度函数（CSF）变得越来越频繁。这种测量通常在远视力条件下进行，并且观察距离及其影响被认为不会显著改变该函数。在这些影响因素中，我们应指出视觉光学系统对刺激的调节以及与此相关的调节误差、观察距离改变时瞳孔直径的变化以及视网膜照明的变化、不同情况下像差（球差、散光）的不同水平等等。所有这些因素导致视觉系统的对比敏感度会根据调节刺激而变化。在本研究中，我们试图通过评估三个观察距离下的CSF来阐明这些不同参数的影响。该研究在单眼视觉、自然瞳孔以及3毫米人工瞳孔条件下进行，这使得在所有距离下都能保持相同水平的视网膜照明。
