Iris pigmentation and visual-geometric illusions

S. Coren, C. Porac

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Blur or degrading of the retinal image has been shown to be a factor in the formation of visual-geometric illusions where intersecting line elements are present. Light irises allow more scattered light within the eye, which results in more image degradation than found in dark-eyed subjects. Measurements on 755 observers show that illusion magnitude varies as a function of iris pigmentation for a configuration with intersecting line elements (Muller-Lyer illusion), but not for a configuration devoid of such features (Ebbinghaus illusion).

Original languageEnglish (US)
Pages (from-to)473-477
Number of pages5
Issue number4
StatePublished - Jan 1 1978

All Science Journal Classification (ASJC) codes

  • Experimental and Cognitive Psychology
  • Ophthalmology
  • Sensory Systems
  • Artificial Intelligence


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