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Related Concept Videos

Color Vision01:24

Color Vision

1.2K
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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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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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Testing a Claim about Population Proportion01:24

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A complete procedure for testing a claim about a population proportion is provided here.
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...
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Related Experiment Video

Updated: Dec 21, 2025

Measurement of Carotenoids in Perifovea using the Macular Pigment Reflectometer
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Cambridge Colour Test: reproducibility in normal trichromats.

T P Fernandes, N A Santos, G V Paramei

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |May 14, 2020
    PubMed
    Summary

    The Trivector subtest of the Cambridge Colour Test shows good reproducibility in color vision testing. Its reliability is high, especially for distinguishing between normal and abnormal color vision.

    Area of Science:

    • Vision Science
    • Ophthalmology
    • Psychophysics

    Background:

    • The Cambridge Colour Test (CCT) is a tool for assessing color vision.
    • The Trivector subtest is a component of the CCT, requiring evaluation for its clinical utility.

    Purpose of the Study:

    • To evaluate the reproducibility and reliability of the Trivector subtest of the Cambridge Colour Test.
    • To assess the Trivector subtest's accuracy in discriminating between normal and abnormal color vision.

    Main Methods:

    • Data collected from normal trichromats in Brazil (N=111) at three time points (T0, T1, T2) and in the UK (N=79) with immediate retest.
    • Bland-Altman indices (coefficients of repeatability) calculated for Protan, Deutan, and Tritan vectors.
    • Intraclass correlation coefficients (ICCs) calculated for both homogeneous (normal observers) and heterogeneous (normal and abnormal observers) datasets.

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    Main Results:

    • Coefficients of repeatability for the Trivector subtest vectors were consistent across Brazilian and UK datasets.
    • Intraclass correlation coefficients (ICCs) were low to moderate for homogeneous datasets of normal observers.
    • ICCs ranged from 0.80 to 0.98 for a heterogeneous dataset, indicating high discriminative accuracy.

    Conclusions:

    • The Trivector subtest demonstrates good reproducibility in color vision assessment.
    • The Trivector subtest exhibits high reliability and discriminative accuracy, particularly in distinguishing between normal and color vision anomaly groups.