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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...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...
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...
Glaucoma: Overview01:25

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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.

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Related Experiment Video

Updated: May 16, 2026

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
12:23

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients

Published on: April 14, 2014

[Decrease in visual acuity: retinal or optic nerve?].

Christophe Orssaud1

  • 1Consultation d'ophtalmologie, Hôpital européen Georges-Pompidou, AP-HP, 75908 Paris Cedex 15, France. christophe.orssaud@egp.aphp.fr

La Revue Du Praticien
|December 12, 2012
PubMed
Summary

Differentiating retinal versus optic nerve causes of vision loss requires ruling out toxic or inherited conditions. Careful examination of retinal and pupillary abnormalities aids diagnosis, sometimes needing longitudinal follow-up.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Medical Diagnostics

Context:

  • Distinguishing between retinal and optic nerve pathologies as causes of visual impairment presents diagnostic challenges.
  • Toxic and inherited conditions are common etiologies, often presenting with bilateral, though sometimes asymmetrical, visual deficits.
  • Systematic examination for retinal abnormalities, pupillary movement disorders, and afferent pupillary defects is crucial.

Purpose:

  • To outline diagnostic strategies for differentiating retinal from optic nerve etiologies of visual decease.
  • To highlight the importance of specific clinical signs and complementary examinations in etiological diagnosis.
  • To address the challenges in diagnosis when initial investigations are inconclusive.

Summary:

  • Identifying the retina or optic nerve as the cause of visual decease necessitates excluding toxic or inherited factors.
  • Retinal examination and pupillary response assessment, including afferent pupillary defect detection, are key diagnostic indicators.
  • Complementary tests and serial examinations may be required to definitively establish the etiology.

Impact:

  • Improves diagnostic accuracy for vision loss, guiding appropriate treatment strategies.
  • Enhances understanding of differential diagnosis for optic neuropathies and retinal diseases.
  • Provides a framework for clinicians managing complex visual deficits.