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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...
Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
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...
Prosopagnosia01:24

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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...

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Related Experiment Video

Updated: May 24, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

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Published on: April 11, 2025

[What vision loss might bring to light].

S Jegerlehner1, D Vogel, C Tappeiner

  • 1Universitätsklinik für Infektiologie, Inselspital Bern.

Praxis
|March 16, 2012
PubMed
Summary

A 36-year-old experienced sudden vision loss due to acute syphilitic posterior placoide chorioretinitis (ASPPC). This case highlights the importance of considering syphilis in vision loss diagnoses.

Area of Science:

  • Ophthalmology
  • Infectious Diseases
  • Neurology

Background:

  • Syphilis, a complex sexually transmitted infection, can manifest with diverse neurological and ocular complications.
  • Ocular syphilis requires prompt diagnosis and treatment to prevent irreversible vision loss.

Observation:

  • A 36-year-old presented with unilateral, painless vision loss.
  • Ophthalmological examination revealed acute syphilitic posterior placoide chorioretinitis (ASPPC).
  • Clinical signs included mucosal lesions and alopecia specifica, indicative of secondary syphilis.

Findings:

  • Serological testing for syphilis was highly reactive.
  • Diagnosis confirmed ASPPC as the cause of vision loss.
  • Associated symptoms pointed to secondary syphilis.

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Implications:

  • This case underscores the critical need for ophthalmologists to consider syphilis in the differential diagnosis of vision impairment.
  • Early detection and appropriate treatment, including penicillin G and corticosteroids to prevent Jarisch-Herxheimer reaction, are crucial for visual recovery.
  • Comprehensive management of ocular syphilis involves thorough diagnostic workup, timely therapy, and diligent follow-up.