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Related Concept Videos

Color Vision01:24

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Visualizing Visual Adaptation
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A method for identifying color vision deficiency malingering.

Andrew Pouw1, Rustum Karanjia2, Alfredo Sadun2

  • 1Yale Department of Ophthalmology & Visual Science, Temple Medical Center, 3rd Floor 40 Temple St., New Haven, CT, 06510, USA. andrew.pouw@yale.edu.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|December 23, 2016
PubMed
Summary

This study introduces a new test to detect malingering of color vision deficiency. The developed test accurately identifies individuals faking color vision deficits with high specificity, aiding in accurate diagnosis.

Keywords:
Color blindnessColor vision deficiencyDiagnostic testsMalingeringPseudo-isochromatic platesPsychophysics

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Psychology

Background:

  • Color vision deficiency (CVD) affects a significant portion of the population.
  • Malingering of CVD can complicate accurate diagnosis and treatment.
  • Existing diagnostic tools may not adequately differentiate genuine CVD from feigned deficits.

Purpose of the Study:

  • To develop and validate a novel psychometric test for identifying malingering of color vision deficiency.
  • To create both a balanced test (sensitivity and specificity) and a specific test (prioritizing specificity).

Main Methods:

  • An online survey was administered to individuals with genuine CVD and those simulating CVD.
  • Color-adjusted Ishihara plates and control plates were used to create two test versions: a 'balanced' test and a 'specific' test.
  • Statistical analyses, including sensitivity, specificity, Youden index, and receiver operating characteristic (ROC) curves, were performed.

Main Results:

  • The 'balanced' test achieved a Youden index of 0.773, with 83.3% sensitivity and 94.0% specificity (AUC of ROC 0.918).
  • The 'specific' test demonstrated 100% specificity in identifying simulators with a cut-off of at least two missed plates (AUC of ROC 0.881).
  • Redshift plates showed the most significant difference between genuine and simulated CVD.

Conclusions:

  • The proposed tests for CVD malingering show high reliability, with AUCs of 0.918 and 0.881.
  • The 'specific' test effectively identifies malingering with 100% specificity using a threshold of two missed plates.