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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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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...
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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: Dec 30, 2025

Using Looming Visual Stimuli to Evaluate Mouse Vision
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Opsins for vision restoration.

Cardillia-Joe Simon1, José-Alain Sahel2, Jens Duebel3

  • 1Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012, Paris, France.

Biochemical and Biophysical Research Communications
|January 27, 2020
PubMed
Summary
This summary is machine-generated.

Optogenetics uses light-sensitive proteins called opsins to restore vision. Microbial and animal opsins are explored for treating retinal blindness, with ongoing clinical trials showing promise.

Keywords:
OpsinsOptogeneticsRetinaRetinal degenerationVision

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Area of Science:

  • Neuroscience
  • Biotechnology
  • Ophthalmology

Background:

  • Optogenetics precisely controls cellular activity using light and genetic targeting.
  • It offers significant therapeutic potential, especially for restoring vision in blind individuals.
  • Restoring vision relies on expressing light-sensitive opsins in neurons.

Purpose of the Study:

  • To review optogenetic approaches for vision restoration in retinal blindness.
  • To compare microbial and animal opsins for their efficacy in treating blindness.
  • To discuss the clinical applications and future potential of these optogenetic strategies.

Main Methods:

  • Discusses microbial opsins from unicellular organisms that mediate ion flow.
  • Examines animal opsins naturally found in mammalian retinas that use G protein signaling.
  • Highlights ongoing clinical trials using microbial opsins for retinitis pigmentosa.

Main Results:

  • Microbial opsins have been extensively used in vision restoration efforts.
  • Two clinical trials are currently underway using microbial opsins.
  • Animal opsins are emerging as promising alternatives with potential for higher light sensitivity and tolerability.

Conclusions:

  • Both microbial and animal opsins represent viable strategies for vision restoration.
  • Animal opsins show potential for improved light sensitivity and patient tolerability.
  • Further research and clinical application of optogenetics hold promise for treating retinal blindness.