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Photoreceptors and Visual Pathways

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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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Updated: Jul 23, 2025

Using Retinal Imaging to Study Dementia

Using Retinal Imaging to Study Dementia

Published on: November 6, 2017

Retinal microvascular abnormalities in major depression.

Evgenii Sadykov¹, Ladislav Hosak¹, Alexandr Stepanov²

¹Department of Psychiatry, Faculty of Medicine in Hradec Kralove, Charles University and University Hospital Hradec Kralove, Hradec Kralove, Czech Republic.

Biomedical Papers of the Medical Faculty of the University Palacky, Olomouc, Czechoslovakia

|July 19, 2023

Summary

This summary is machine-generated.

Major depression is linked to significant retinal microvascular changes, including wider arterioles and venules. These findings suggest potential shared pathology between the brain and retina in depression.

Keywords:

biomarker depression neuroinflammation retinal microvascular abnormality

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Area of Science:

Ophthalmology
Neuroscience
Psychiatry

Background:

Retinal microvascular abnormalities may be associated with major depression.
Understanding this link is crucial for non-geriatric populations.

Purpose of the Study:

To investigate the association between retinal microvascular changes and major depression.
To explore potential shared pathophysiological mechanisms.

Main Methods:

Cross-sectional study comparing 50 patients with major depression to 50 healthy controls.
Retinal images captured using Zeiss FF450 and oDocs cameras.
Diagnosis based on ICD-10 classification for depressive disorders.

Main Results:

Patients with major depression exhibited significantly larger arteriolar (P<0.0001) and venular (P<0.001-0.0001) calibres compared to controls.
Microvascular changes were evident in the retina of individuals with depressive disorder.

Conclusions:

Shared embryonic origin suggests similar microvascular pathology in retina and brain in major depression.
Neuroinflammation associated with microvascular changes may play a role in depression.
Findings may aid in understanding depression's origins and personalizing treatment.