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Related Concept Videos

Photoreceptors and Visual Pathways01:22

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, whereas...
Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
Disorders of Erythrocytes01:27

Disorders of Erythrocytes

Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...

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Related Experiment Video

Updated: Jun 1, 2026

Retinal Pathophysiological Evaluation in a Rat Model
09:11

Retinal Pathophysiological Evaluation in a Rat Model

Published on: May 6, 2022

Retinal disorders.

Klara Landau1, Malaika Kurz-Levin

  • 1Department of Ophthalmology, University Hospital Zurich, Switzerland. Klara.Landau@usz.ch

Handbook of Clinical Neurology
|May 24, 2011
PubMed
Summary
This summary is machine-generated.

This chapter reviews retinal disorders, including those with subtle or no visible changes, and their connection to central nervous system (CNS) diseases. It details diagnostic tools and common retinal conditions relevant to neurologists.

Related Experiment Videos

Last Updated: Jun 1, 2026

Retinal Pathophysiological Evaluation in a Rat Model
09:11

Retinal Pathophysiological Evaluation in a Rat Model

Published on: May 6, 2022

Area of Science:

  • Ophthalmology
  • Neurology
  • Neuroscience

Background:

  • The retina is part of the central nervous system (CNS), with optic nerve involvement crucial for visual pathways.
  • Retinal diseases can cause visual loss, sometimes with subtle abnormalities not detected during routine ophthalmological exams.
  • Neurologists encounter unexplained visual loss and CNS diseases manifesting in the retina.

Purpose of the Study:

  • To provide an overview of retinal disorders relevant to neurological conditions.
  • To discuss retinal diseases with minimal or no observable fundus abnormalities.
  • To cover key retinal diseases affecting the ocular fundus and their diagnostic approaches.

Main Methods:

  • Review of retinal disorders and their association with neurological diseases.
  • Description of examination techniques and diagnostic tools for retinal abnormalities.
  • Discussion of specific conditions including tumors, vascular diseases, and inherited dystrophies.

Main Results:

  • Certain retinal disorders present with limited or no detectable abnormalities during fundus examination.
  • Retinal manifestations are important indicators of underlying CNS diseases.
  • A range of retinal conditions, from diabetic retinopathy to inherited dystrophies and CNS-related disorders, are discussed.

Conclusions:

  • Understanding retinal abnormalities is crucial for neurologists diagnosing unexplained visual loss and CNS conditions.
  • The chapter highlights the spectrum of retinal diseases, emphasizing those with subtle signs and neurological links.
  • Comprehensive diagnostic approaches are essential for managing diverse retinal pathologies.