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Related Concept Videos

Color Vision01:24

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 Pathways01:22

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...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Incomplete Dominance01:43

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

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Visualizing Visual Adaptation
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Published on: April 24, 2017

Using Patterns to Encode Color Information for Dichromats.

Behzad Sajadi, Aditi Majumder, Manuel M Oliveira

    IEEE Transactions on Visualization and Computer Graphics
    |March 28, 2012
    PubMed
    Summary
    This summary is machine-generated.

    Overlaying patterns on visualizations improves color identification for individuals with color vision deficiency (CVD). This novel, content-independent method aids dichromats and even enhances accuracy for normal trichromats.

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    Area of Science:

    • Human-Computer Interaction
    • Visualization
    • Accessibility

    Background:

    • Color is crucial for information transfer in visualizations.
    • Color vision deficiency (CVD) affects 200 million people, causing red-green/blue-yellow ambiguities and hindering comprehension.
    • Existing CVD solutions are content-specific and often ineffective for diverse color palettes or color identification.

    Purpose of the Study:

    • To introduce a content-independent pattern overlay technique for enhancing visualization accessibility for individuals with CVD.
    • To enable effective color identification and reduce ambiguities for dichromats.
    • To ensure the method benefits normal trichromats without compromising their perception.

    Main Methods:

    • Developed a novel technique to overlay patterns onto colored visualization content.
    • The method is content-independent, applying universally across different visualization types.
    • Validated through two user studies involving participants with and without CVD.

    Main Results:

    • Overlaying patterns significantly improved performance for dichromats in color-based visualization tasks, nearing normal trichromat levels.
    • The pattern technique facilitates accurate color identification for individuals with CVD.
    • Normal trichromats also showed improved accuracy when using the pattern-augmented visualizations.

    Conclusions:

    • Pattern overlays offer a universally applicable solution to improve visualization accessibility for individuals with CVD.
    • This method effectively minimizes color ambiguities and aids color identification for dichromats.
    • The technique enhances visualization interpretation for all users, including normal trichromats.