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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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Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
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Association Between Regular Cannabis Use and Ganglion Cell Dysfunction.

Thomas Schwitzer1, Raymund Schwan2, Eliane Albuisson3

  • 1Pôle Hospitalo-Universitaire de Psychiatrie du Grand Nancy, Centre Psychothérapique de Nancy, Laxou, France2EA7298 Interactions gènes-risques environnementaux et effets sur la santé, Université de Lorraine, Vandœuvre-lès-Nancy, Nancy, France3Institut National de la Santé et de la Recherche Médicale U1114, Fédération de Médecine Translationnelle de Strasbourg, Département de Psychiatrie, Centre Hospitalier Régional Universitaire de Strasbourg, Strasbourg, France.

JAMA Ophthalmology
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PubMed
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Regular cannabis use is linked to delayed nerve signal transmission in the retina, potentially affecting vision. This finding highlights cannabis

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Public Health

Background:

  • Cannabis use is a significant public health issue.
  • Cannabis affects central neurotransmission.
  • Retinal ganglion cells are integral to visual processing and brain function.

Purpose of the Study:

  • To investigate if regular cannabis use alters retinal ganglion cell function in humans.
  • To assess potential neurotoxic effects of cannabis on the central nervous system via retinal processing.

Main Methods:

  • A case-control study comparing regular cannabis users and healthy controls.
  • Pattern electroretinography (PERG) was used to measure retinal function.
  • N95 wave amplitude and implicit time were the primary outcome measures.

Main Results:

  • Cannabis users exhibited significantly delayed N95 implicit time compared to controls (P < .001).
  • Receiver operating characteristic analysis showed good classification accuracy (AUC = 0.84).
  • The study identified a specific threshold for N95 implicit time differentiating users from non-users.

Conclusions:

  • Regular cannabis use is associated with delayed action potential transmission in retinal ganglion cells.
  • These findings suggest potential alterations in vision and neurotoxic effects of cannabis on the central nervous system.
  • The results underscore the importance of considering cannabis' impact on neural processing and public health.