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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...
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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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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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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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Related Experiment Video

Updated: Oct 5, 2025

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Bilateral sequential non-arteritic optic neuropathy post-COVID-19.

Abhilasha Sanoria1, Parul Jain1, Ritu Arora1

  • 1Gurunanak Eye Center, Maulana Azad Medical College, New Delhi, India.

Indian Journal of Ophthalmology
|January 28, 2022
PubMed
Summary

A rare case of bilateral non-arteritic anterior ischemic optic neuropathy (NAION) occurred after COVID-19 infection. This vision loss was irreversible despite treatment, highlighting the need for post-COVID follow-up.

Keywords:
Bilateral Non-arteritic Anterior Ischemic Optic Neuropathy (NAION)COVID-19neuro-ophthalmic manifestation

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Area of Science:

  • Ophthalmology
  • Neurology
  • Infectious Diseases

Background:

  • COVID-19 is known to cause various neuro-ophthalmic issues.
  • Bilateral non-arteritic anterior ischemic optic neuropathy (NAION) following COVID-19 has not been previously documented.

Observation:

  • A 45-year-old male experienced bilateral vision blurring one month after a COVID-19 infection.
  • Clinical examination and investigations confirmed bilateral NAION as the cause of vision loss.

Findings:

  • The patient received a course of oral steroids, but vision recovery was not achieved.
  • This case represents the first reported instance of bilateral NAION secondary to COVID-19.

Implications:

  • Healthcare providers should be vigilant for potential neuro-ophthalmic complications after COVID-19.
  • Close patient follow-up post-COVID-19 is crucial for early detection and management of sequelae like NAION.
  • This case underscores the diverse and sometimes severe neurological and visual impacts of SARS-CoV-2 infection.