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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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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...
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Vision01:24

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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.
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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...
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Visual System01:26

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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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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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...
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Related Experiment Video

Updated: Jul 15, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

443

Current perspective: Cerebral visual impairment-The impending doom.

Swati Phuljhele1, Gunjan Saluja2, Rebika Dhiman1

  • 1Strabismus, Pediatric Ophthalmology and Neuro-Ophthalmology Services, Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All Institute of Medical Sciences, New Delhi, India.

Indian Journal of Ophthalmology
|October 3, 2023
PubMed
Summary
This summary is machine-generated.

Cerebral visual impairment (CVI) significantly impacts young children, often presenting with visual and motor issues. An integrated management approach is crucial for addressing these complex challenges.

Keywords:
Cerebral visual impairmentcortical visual dysfunctionvision therapy

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Area of Science:

  • Pediatric Neurology
  • Ophthalmology
  • Developmental Pediatrics

Background:

  • Cerebral visual impairment (CVI) is a growing concern in pediatric health.
  • Children with CVI frequently exhibit diverse visual symptoms and motor deficits.
  • Current management strategies necessitate a more integrated approach.

Purpose of the Study:

  • To offer a comprehensive overview of Cerebral visual impairment (CVI).
  • To detail the clinical manifestations, diagnostic evaluations, and therapeutic interventions for CVI in children.

Main Methods:

  • Literature review focusing on pediatric CVI.
  • Synthesis of information on CVI assessment and management protocols.
  • Analysis of current research trends in CVI.

Main Results:

  • CVI presents with a wide spectrum of visual dysfunctions.
  • Early and accurate diagnosis is vital for effective intervention.
  • Multidisciplinary management improves outcomes for children with CVI.

Conclusions:

  • An integrated approach is essential for optimizing the care of children with CVI.
  • Further research is needed to refine diagnostic tools and therapeutic strategies.
  • Addressing both visual and motor abnormalities is key to comprehensive CVI management.