Woods R L, Bradley A, Atchison D A
Centre for Eye Research, School of Optometry, Queensland University of Technology, Australia.
Vision Res. 1996 Nov;36(22):3587-96. doi: 10.1016/0042-6989(96)00091-0.
Though the human eye generally creates a single image on the retina, the literature contains many examples showing perceptual monocular diplopia. Previously, monocular diplopia resulting from astigmatic defocus has been demonstrated to cause a notch (local minimum) in the contrast sensitivity function (CSF). We examine Verhoeff's (1900) model which explains how monocular diplopia can occur through an interaction between defocus and common ocular aberrations. From the measured ocular transverse aberration function and from the measured monocular diplopia of three cyclopleged subjects we predicted multiple notches in the CSF with hyperopic spherical defocus. Monochromatic and polychromatic CSF were measured for vertical gratings with best refraction and with simulated myopia and hyperopia. Multiple notches in CSF were observed experimentally. Notches in the polychromatic CSF were smaller and broader than those found in the monochromatic CSF. Our aberration model was successful in predicting notches in the CSF with hyperopic spherical defocus. The implications for clinical measurement of CSF are discussed.
虽然人眼通常在视网膜上形成单个图像，但文献中有许多显示感知性单眼复视的例子。此前，已证明由散光性散焦导致的单眼复视会在对比敏感度函数（CSF）中产生一个凹口（局部最小值）。我们研究了韦尔霍夫（1900年）的模型，该模型解释了单眼复视如何通过散焦与常见眼像差之间的相互作用而发生。根据测量的眼横向像差函数以及三名睫状肌麻痹受试者的测量单眼复视，我们预测了远视性球面散焦时CSF中的多个凹口。针对具有最佳屈光状态以及模拟近视和远视的垂直光栅测量了单色和多色CSF。实验观察到CSF中的多个凹口。多色CSF中的凹口比单色CSF中的凹口更小且更宽。我们的像差模型成功预测了远视性球面散焦时CSF中的凹口。讨论了其对CSF临床测量的意义。
