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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...
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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...
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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...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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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Optical Coherence Tomography: Imaging Mouse Retinal Ganglion Cells In Vivo
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Published on: September 22, 2017

Late-onset Visual Loss in Osteopetrosis.

Abdul-Majid Wangai1, Sheila Waa, Maryam Wangai

  • 1Aga Khan University Hospital, Nairobi, Kenya;

Sultan Qaboos University Medical Journal
|November 17, 2011
PubMed
Summary

This case report details a young woman experiencing sudden blindness due to optic nerve entrapment. It underscores the importance of considering nerve entrapment in patients with unexplained fractures and vision loss.

Keywords:
BlindnessCase reportEastern AfricaLate onsetOsteopetrosis

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Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

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Published on: May 25, 2020

Area of Science:

  • Neurology
  • Ophthalmology
  • Orthopedics

Background:

  • Late-onset visual loss can result from nerve entrapment or elevated intracranial pressure.
  • Unexplained fractures may indicate underlying systemic or neurological conditions.

Purpose of the Study:

  • To report the first case of optic nerve entrapment causing visual loss in Eastern Africa.
  • To emphasize the diagnostic considerations for patients presenting with unexplained fractures and subsequent vision impairment.

Main Methods:

  • Case report of a 23-year-old female patient.
  • Clinical presentation analysis including sudden blindness, headaches, and weakness.
  • Review of prior medical history for multiple unexplained fractures.

Main Results:

  • Optic nerve entrapment was identified as the cause of the patient's sudden blindness.
  • The patient had a history of multiple unexplained fractures.

Conclusions:

  • Optic nerve entrapment can lead to severe visual impairment.
  • A high index of suspicion is crucial for diagnosing nerve entrapment in patients with a history of unexplained fractures and late-onset blindness.