EFFECT ON GRATING IDENTIFICATION OF SAMPLING WITH DEGENERATE ARRAYS
EFFECT ON GRATING IDENTIFICATION OF SAMPLING WITH DEGENERATE ARRAYS
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DOI：
10.1364/josaa.9.000472
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发表时间：
1992-03-01
影响因子：
1.9
通讯作者：
GREEN, DG
中科院分区：
文献类型：
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作者：
GELLER, AM;SIEVING, PA;GREEN, DG
我们测量了观察者在识别由简并采样阵列采样的光栅方面的性能。仅在减去超过 88% 的采样元素后，高空间频率刺激的光栅识别才降至阈值水平。尽管对正常观察者的几项研究表明，中心凹视力与从解剖学感光器密度得出的感光器间间距的估计相对应，但采样元件密度到平均间距的简单转换并不能描述我们对简并采样阵列的模拟结果。就我们的模型模拟视网膜病理学的解剖学变化而言，我们的结果表明，光栅敏锐度反映了退化视网膜中保留解剖结构的小区域的正常高空间采样率，而不是大规模退化后中心凹受体的平均密度或间距。
We have measured observer performance in identifying gratings that were sampled by degenerate-sampling arrays. Grating identification for high-spatial-frequency stimuli fell to threshold levels only after more than 88% of the sampling elements were subtracted. Although several studies with normal observers have shown that foveal visual acuity corresponds to estimates of interphotoreceptor spacing derived from anatomical photo-receptor density, a simple transformation of sampling-element density to mean spacing does not describe the results in our simulation of degenerate-sampling arrays. To the extent that our model simulates the anatomical changes of retinal pathology, our results suggest that grating acuity reflects the normal high-spatial-sampling rate of small regions of preserved anatomy in the degenerate retina rather than the mean density or spacing of foveal receptors after massive degeneration.