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Related Concept Videos

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: 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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Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

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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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Accessory Structures of the Eye01:17

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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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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 12, 2025

Comparing Objective Conjunctival Hyperemia Grading and the Ocular Surface Disease Index Score in Dry Eye Syndrome During COVID-19
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Concurrent and Post COVID-19 Ophthalmological Implications.

Tamer Wasfy1, Mohamed A Eldesouky1, Yasser Serag1

  • 1Ophthalmology Department, Tanta University, Tanta, Egypt.

Clinical Ophthalmology (Auckland, N.Z.)
|November 25, 2021
PubMed
Summary

COVID-19 can cause various eye problems, including conjunctivitis and neuro-retinal issues. Even after recovering from COVID-19, individuals may still experience these ophthalmological manifestations, highlighting the need for continued monitoring.

Keywords:
COVID-19conjunctivitisorbital cellulitispapillophlebitisretinal vein occlusion

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Area of Science:

  • Ophthalmology
  • Infectious Diseases
  • Public Health

Background:

  • COVID-19 (Coronavirus Disease 2019) primarily affects the respiratory system but has been associated with ocular complications.
  • Ophthalmological manifestations can occur during acute infection or post-recovery.

Purpose of the Study:

  • To investigate the spectrum and frequency of eye conditions in patients with COVID-19.
  • To determine if ocular manifestations manifest during the disease course or after recovery.

Main Methods:

  • Retrospective analysis of medical records from 425 confirmed COVID-19 patients.
  • Data collected from three isolation hospitals in Gharbeya Governorate, Egypt.

Main Results:

  • 30.8% of patients (131/425) exhibited ophthalmological manifestations.
  • Conjunctivitis was the most common (26.1%), followed by neuro-retinal issues (2.1%) and fungal orbital cellulitis (1.4%).
  • Most ocular issues occurred concurrently with COVID-19, except for fungal orbital cellulitis, which appeared post-recovery.

Conclusions:

  • COVID-19 infection is linked to a range of ocular complications.
  • Eye health may be compromised even after recovery from COVID-19, particularly in high-risk individuals.