Discrimination thresholds of normal and anomalous trichromats: Model of senescent changes in ocular media density on the Cambridge Colour Test

Keizo Shinomori, Athanasios Panorgias, John S Werner

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Age-related changes in chromatic discrimination along dichromatic confusion lines were measured with the Cambridge Colour Test (CCT). One hundred and sixty-two individuals (16 to 88 years old) with normal Rayleigh matches were the major focus of this paper. An additional 32 anomalous trichromats classified by their Rayleigh matches were also tested. All subjects were screened to rule out abnormalities of the anterior and posterior segments. Thresholds on all three chromatic vectors measured with the CCT showed age-related increases. Protan and deutan vector thresholds increased linearly with age while the tritan vector threshold was described with a bilinear model. Analysis and modeling demonstrated that the nominal vectors of the CCT are shifted by senescent changes in ocular media density, and a method for correcting the CCT vectors is demonstrated. A correction for these shifts indicates that classification among individuals of different ages is unaffected. New vector thresholds for elderly observers and for all age groups are suggested based on calculated tolerance limits.

Original languageEnglish (US)
Pages (from-to)A65-A76
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume33
Issue number3
DOIs
StatePublished - Mar 1 2016

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Medicine(all)
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition

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