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Color Vision

Color Vision

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.

Reliability and Validity

Reliability and Validity

Reliability and validity are two important considerations that must be made with any type of data collection. Reliability refers to the ability to consistently produce a given result. In the context of psychological research, this would mean that any instruments or tools used to collect data do so in consistent, reproducible ways.

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Related Experiment Video

Updated: Jun 11, 2026

Methods to Test Visual Attention Online

Methods to Test Visual Attention Online

Published on: February 19, 2015

[Test-retest reliability of a web-based colour vision test].

J Kuchenbecker¹, F Roehl, J Bernarding

¹Augenklinik, Helios Klinikum Berlin Buch, Berlin. joern.kuchenbecker@helioskliniken.de

Klinische Monatsblatter Fur Augenheilkunde

|July 6, 2010

Summary

This web-based color vision test is reliable for screening, showing reproducible results when repeated after more than one day. Ensure serious intent for accurate color vision screening outcomes.

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Area of Science:

Ophthalmology
Human Physiology

Context:

Screening tests for visual impairments require high reliability, sensitivity, and specificity.
Web-based tests offer accessibility and potentially lower costs for widespread screening.

Purpose:

To evaluate the test-retest reliability of a web-based color vision test.
To determine the influence of the time interval between tests on reliability.

Summary:

The study analyzed 386 subjects performing a web-based color vision test twice.
Reliability, assessed by kappa coefficient, increased with the time interval between tests, reaching 0.83 for intervals over two years.
Systematic differences were not found for intervals exceeding one day, indicating good reproducibility.

Impact:

The web-based color vision test demonstrates good reliability under uncontrolled conditions.
Results suggest the test is a viable screening tool, provided users are serious and avoid manipulation.
Establishing a retest interval of over one day ensures reliable color vision assessment.