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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.

Photoreceptors and Visual Pathways

Photoreceptors and Visual Pathways

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, whereas...

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Related Experiment Video

Updated: Jun 28, 2026

$Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter$

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

Repeatability of the Holmes-Wright type A lantern color vision test.

Jeffery K Hovis¹

¹School of Optometry, University of Waterloo, Waterloo, Ontario, Canada. jhovis@uwaterloo.ca

Aviation, Space, and Environmental Medicine

|November 13, 2008

Summary

The Holmes-Wright Type A Lantern (HWA) test shows good repeatability for normal color vision individuals. However, specific criteria for defective color vision need refinement to ensure reliable HWA test results.

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Measuring the Behavioral Effects of Intraocular Scatter

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Last Updated: Jun 28, 2026

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Published on: September 16, 2025

Measuring the Behavioral Effects of Intraocular Scatter

Measuring the Behavioral Effects of Intraocular Scatter

Published on: February 18, 2021

Area of Science:

Ophthalmology
Vision Science
Human Factors Engineering

Background:

The Holmes-Wright Type A Lantern (HWA) is used for color vision testing.
Recent studies question the internal consistency and repeatability of the HWA test.
This necessitates an evaluation of the HWA's reliability across different scoring criteria.

Purpose of the Study:

To determine the repeatability of the Holmes-Wright Type A Lantern (HWA) test.
To assess HWA test reliability using various established pass/fail criteria.
To identify optimal scoring methods for consistent HWA test outcomes.

Main Methods:

78 normal color vision (NCV) and 80 defective color vision (DCV) individuals were tested twice.
Three runs of test lights were administered under dim illumination for all participants.
Repeatability was assessed using criteria including Joint Aviation Requirements, Farnsworth, CIE, perfect performance, and percentile scores.

Main Results:

High agreement (96%) for passing both sessions was observed in NCV individuals.
DCV agreement for passing both sessions ranged from 0.62 to 0.80, with lower values for criteria stopping after one perfect run.
High agreement (0.97-0.99) was found for DCV individuals failing both sessions.

Conclusions:

The practice of stopping the HWA test after a single perfect performance should be discontinued.
Administering three runs with a maximum of two errors is a repeatable method.
This refined method ensures all NCV individuals pass and reduces discrepancies for DCV individuals tested across sessions.