Irving E L, Robertson K M
School of Optometry, University of Waterloo, Canada.
Ophthalmic Physiol Opt. 1996 Jul;16(4):326-35.
The monocular components of the forced vergence fixation disparity curve were evaluated for equal retinal images and for two kinds of monocular retinal image degradation. Computer-generated nonius lines were used to measure the fixation disparity curve components. Monocular defocus was obtained by placing convex lenses before one eye. In the second instance monocular image degradation was achieved by placing light-scattering filters before one eye. A small percentage of subjects displayed unequal distribution of the monocular components of fixation disparity with no image degradation. For both conditions of monocular image degradation, the distribution of the monocular components was found to be biased in favor of the clear image. However, defocus, which affects the high spatial frequencies relatively more than scatter, was found to have a greater effect on the distribution of the monocular components of fixation disparity than scatter.
针对视网膜像相等以及两种单眼视网膜像退化的情况，对强迫性集合注视差异曲线的单眼成分进行了评估。使用计算机生成的视差线来测量注视差异曲线成分。通过在一只眼前放置凸透镜来实现单眼散焦。在第二种情况下，通过在一只眼前放置光散射滤光片来实现单眼图像退化。一小部分受试者在无图像退化时表现出注视差异单眼成分的分布不均。对于单眼图像退化的两种情况，均发现单眼成分的分布偏向于清晰图像。然而，相较于散射，散焦对高空间频率的影响相对更大，且发现散焦对注视差异单眼成分分布的影响比散射更大。
