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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: Overview01:25

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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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Angle Closure Glaucoma: Treatment01:28

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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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Vision01:24

Vision

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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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Open Angle Glaucoma: Treatment01:27

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In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
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Focusing of Light in the Eye01:16

Focusing of Light in the Eye

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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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Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

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Acute Vision Loss.

Nika Bagheri1, Sonia Mehta2

  • 1Wills Eye Hospital, Department of Ophthalmology, Thomas Jefferson University, 840 Walnut Street, Suite 800, Philadelphia, PA 19107, USA.

Primary Care
|August 31, 2015
PubMed
Summary
This summary is machine-generated.

Sudden vision loss can be temporary or lasting. Differentiating between one or both eyes affected and the duration is key for diagnosing nontraumatic causes and guiding patient care.

Keywords:
Amaurosis fugaxIschemic optic neuropathyMigraineOptic neuritisPapilledemaRetinal detachmentRetinal vascular occlusionVertebrobasilar insufficiencyVitreous hemorrhage

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Area of Science:

  • Ophthalmology
  • Neurology

Background:

  • Acute vision loss presents a diagnostic challenge.
  • Distinguishing transient (<24 hours) from persistent (>24 hours) vision loss is crucial.
  • Determining unilateral versus bilateral involvement aids in differential diagnosis.

Purpose of the Study:

  • To review the causes of acute, nontraumatic vision loss.
  • To provide management strategies for healthcare providers.
  • To improve patient triage for acute vision loss.

Main Methods:

  • Literature review of nontraumatic acute vision loss.
  • Analysis of diagnostic criteria for transient and persistent vision loss.
  • Synthesis of clinical pearls for management and triage.

Main Results:

  • Identified key differentiating factors: duration and laterality of vision loss.
  • Highlighted common nontraumatic etiologies.
  • Emphasized the importance of prompt assessment.

Conclusions:

  • Accurate assessment of vision loss characteristics is paramount.
  • Effective triage relies on understanding underlying causes.
  • Management pearls can optimize patient outcomes in acute vision loss scenarios.