Effect on grating identification of sampling with degenerate arrays

Andrew M. Geller, Paul A. Sieving, Daniel G. Green

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


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 photoreceptor 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.

Original languageEnglish (US)
Pages (from-to)472-477
Number of pages6
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number3
StatePublished - Mar 1992
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition


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