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Photoreceptors and Visual Pathways

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,...

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Related Experiment Video

Updated: Mar 5, 2026

Optimization of the Retinal Vein Occlusion Mouse Model to Limit Variability

Optimization of the Retinal Vein Occlusion Mouse Model to Limit Variability

Published on: August 6, 2021

Retinal Vein Occlusions.

Jost B Jonas, Jordi Monés, Agnès Glacet-Bernard

Developments in Ophthalmology

|March 29, 2017

Summary

This summary is machine-generated.

Retinal vein occlusions (RVOs) are diagnosed using advanced retinal angiography. Optical coherence tomography (OCT) angiography aids in assessing macular edema and ischemia, guiding treatment for better patient outcomes.

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Last Updated: Mar 5, 2026

Optimization of the Retinal Vein Occlusion Mouse Model to Limit Variability

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Area of Science:

Ophthalmology
Retinal Vascular Disorders
Diagnostic Imaging

Background:

Retinal vein occlusions (RVOs) are retinal vascular disorders causing vein dilation, hemorrhages, macular edema, and ischemia.
Accurate diagnosis and prognosis assessment are crucial for effective RVO management.

Purpose of the Study:

To highlight the diagnostic and prognostic value of various retinal angiography techniques for RVOs.
To emphasize the role of OCT angiography in conjunction with dye angiography for comprehensive assessment.

Main Methods:

Utilizing fluorescein and indocyanine green (ICG) angiography for RVO diagnosis.
Employing optical coherence tomography (OCT)-based angiography for detailed macular and ischemic evaluation.
Assessing biomarkers like the outer limiting membrane and photoreceptor integrity via OCT.

Main Results:

Retinal angiography differentiates RVO types (perfused/nonperfused) and tracks disease progression.
OCT angiography combined with dye angiography effectively quantifies macular edema and ischemia.
OCT provides prognostic biomarkers and treatment guidance by evaluating retinal structures.

Conclusions:

Advanced retinal angiography, particularly OCT angiography, is essential for diagnosing and managing RVOs.
OCT angiography offers critical insights into macular edema, ischemia, and retinal integrity, guiding therapeutic decisions.
Intravitreal therapies like steroids and anti-VEGF agents are preferred over laser coagulation for RVO treatment, with consideration for steroid side effects.