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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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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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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Focusing of Light in the Eye01:16

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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

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Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
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Prosopagnosia01:24

Prosopagnosia

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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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Related Experiment Video

Updated: May 17, 2025

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

Published on: April 11, 2025

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Approach to Vision Loss.

Nancy J Newman, Valérie Biousse

    Continuum (Minneapolis, Minn.)
    |April 3, 2025
    PubMed
    Summary

    Diagnosing vision loss requires neurologists to master eye and visual pathway examinations. Understanding ocular and neurological causes aids in localizing and differentiating vision impairment for accurate diagnosis.

    Area of Science:

    • Neurology
    • Ophthalmology
    • Neuroscience

    Background:

    • Vision loss diagnosis is crucial for neurologists.
    • The visual system, including eyes, optic nerves, and intracranial pathways, constitutes a significant portion of the brain.
    • Patients with vision loss frequently consult both neurologists and eye care specialists.

    Purpose of the Study:

    • To outline the examination of the eye and visual pathways for neurologists.
    • To provide a framework for the differential diagnosis of vision loss based on localization.
    • To emphasize the importance of recognizing ocular causes of vision loss.

    Main Methods:

    • Review of the standard bedside examination of the visual system.
    • Discussion of ancillary testing for visual pathway structure and function.

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    Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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    Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

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  • Integration of portable diagnostic instruments in clinical settings.

    • Main Results:

    • A systematic approach to vision loss involves history, examination, and localization.
    • Differential diagnosis should be based on the identified location of the pathophysiologic process.
    • Neurologists must differentiate between ocular and neurological causes of vision impairment.

    Conclusions:

    • Effective diagnosis of vision loss relies on a thorough understanding of the visual system and its potential pathologies.
    • Coordinated care between neurologists and ophthalmologists is vital for optimal patient outcomes.
    • Augmenting bedside examinations with specialized testing improves diagnostic accuracy.