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Related Concept Videos

Vision01:24

Vision

61.4K
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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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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Glaucoma: Overview01:25

Glaucoma: Overview

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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...
1.6K
Prosopagnosia01:24

Prosopagnosia

1.1K
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...
1.1K
Visual System01:26

Visual System

2.3K
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.
Once through the pupil, the light passes through the lens, a...
2.3K

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Related Experiment Video

Updated: Mar 26, 2026

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

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[Visual prostheses].

P Walter1

  • 1Klinik für Augenheilkunde, Uniklinik RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Deutschland. pwalter@ukaachen.de.

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|January 24, 2016
PubMed
Summary
This summary is machine-generated.

Sensory neuroprostheses, like retinal implants, offer a new treatment for blindness by restoring basic visual functions. These systems use cameras and electrode arrays to stimulate the visual system, with a low complication rate.

Keywords:
BlindnessNeural prosthesesRetinal implantRetinitis pigmentosaVision, ocular

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Ophthalmology

Background:

  • Untreatable blindness poses a significant challenge.
  • Sensory neuroprostheses offer a technical solution for vision restoration.

Purpose of the Study:

  • To review the current state of sensory neuroprostheses for vision restoration.
  • To discuss the technology, applications, and regulatory status of retinal implant systems.

Main Methods:

  • Description of sensory neuroprosthesis systems, including sensors, electrode arrays, and signal processing.
  • Explanation of energy supply and data transfer methods (cable connections, telemetric inductive links).
  • Review of currently approved retinal implant systems in the European Union.

Main Results:

  • Two retinal implant systems are approved in the EU for patients with retinitis pigmentosa.
  • These systems can restore basic visual functions.
  • The complication rate is relatively low considering the surgical complexity.

Conclusions:

  • Sensory neuroprostheses represent a viable approach for treating certain types of blindness.
  • Approved retinal implant systems demonstrate efficacy and safety.
  • Further development and approval studies for new systems are underway.