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Related Concept Videos

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,...
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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.
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.

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Related Experiment Video

Updated: Jul 8, 2026

Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings
08:33

Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings

Published on: February 26, 2016

[Photopic contrast sensitivity. Local contrast perception].

M Bach1, W Wesemann, G Kolling

  • 1Universitäts-Augenklinik Freiburg, Deutschland. michael.bach@uni-freiburg.de

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|January 25, 2008
PubMed
Summary
This summary is machine-generated.

Contrast sensitivity (CS) testing is crucial for visual function assessment but requires careful standardization due to variability. This report details CS testing principles, common tests, and their clinical relevance for accurate diagnosis and monitoring.

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Area of Science:

  • Ophthalmology and Visual Science
  • Psychophysics
  • Clinical Optics

Context:

  • Contrast sensitivity (CS) is a key visual function impacted by optical and neural factors.
  • Accurate CS measurement is vital for clinical applications like disease monitoring, surgical outcomes, and safety assessments.
  • Standardization is critical due to CS test variability and common ceiling effects.

Purpose:

  • To provide a comprehensive overview of contrast sensitivity testing.
  • To cover the physiological basis, testing principles, and strategies for CS assessment.
  • To present a comparative table of commonly used CS tests.

Summary:

  • CS is influenced by optical aberrations and neural conditions like glaucoma.
  • CS testing aids in disease monitoring, surgical evaluations, and screening.
  • Disability glare can be measured by adding a glare source to CS tests.
  • Maximal standardization is essential for reliable follow-up examinations.

Impact:

  • Enhances understanding of contrast sensitivity testing methodologies.
  • Provides a resource for clinicians and researchers in visual psychophysics.
  • Aids in selecting appropriate tests for various clinical and research settings.
  • Highlights the importance of standardized protocols for accurate visual function assessment.