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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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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: Sep 8, 2025

Visualizing Visual Adaptation
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Achromatopsia.

Kristina J Hartung1,2, Stephen H Tsang3, Tarun Sharma4

  • 1Department of Ophthalmology, University Medical Centre Ljubljana, Ljubljana, Slovenia.

Advances in Experimental Medicine and Biology
|July 30, 2025
PubMed
Summary
This summary is machine-generated.

Spectral domain optical coherence tomography (SD-OCT) visualizes the progression of achromatopsia. This imaging technique helps track changes in the retina associated with this inherited eye condition.

Keywords:
AchromatopsiaAutosomal recessiveRod monochromatism

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Area of Science:

  • Ophthalmology
  • Medical Imaging

Background:

  • Achromatopsia is a rare inherited retinal disorder.
  • It is characterized by reduced visual acuity, photophobia, and impaired color vision.

Purpose of the Study:

  • To illustrate the diagnostic utility of spectral domain optical coherence tomography (SD-OCT) in visualizing achromatopsia.
  • To document the characteristic retinal changes in achromatopsia using SD-OCT.

Main Methods:

  • Spectral domain optical coherence tomography (SD-OCT) was employed.
  • High-resolution cross-sectional retinal images were acquired.

Main Results:

  • Figure 24.1 presents key stages of achromatopsia.
  • SD-OCT reveals specific alterations in retinal layers corresponding to disease progression.

Conclusions:

  • SD-OCT is a valuable tool for assessing achromatopsia.
  • Imaging provides insights into the structural changes occurring in achromatopsia.