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Related Concept Videos

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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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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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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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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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Photoreceptors and Visual Pathways01:22

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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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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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Updated: Dec 24, 2025

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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Central visual function and inner retinal structure in primary open-angle glaucoma.

Li-Juan Xu1,2, Sha-Ling Li1, Vance Zemon3

  • 1Clinical and Epidemiological Eye Research Center, Eye Hospital, School of Optometry and Ophthalmology, Wenzhou Medical University, Wenzhou 325027, China.

Journal of Zhejiang University. Science. B
|April 8, 2020
PubMed
Summary
This summary is machine-generated.

This study reveals that central visual function, measured by isolated-check visual evoked potential (icVEP) signal-to-noise ratio (SNR) and mean macular sensitivity (mMS), is significantly associated with inner retinal structure in primary open-angle glaucoma (POAG). These relationships vary by glaucoma severity.

Keywords:
Isolated-check visual evoked potential (icVEP); Primary open-angle glaucoma (POAG); Optical coherence tomography (OCT); Standard automated perimetry (SAP)

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Medical Imaging

Background:

  • Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
  • Understanding the relationship between visual function and retinal structure is crucial for POAG management.
  • Inner retinal layers, including the ganglion cell complex, are primary targets in POAG.

Purpose of the Study:

  • To investigate the associations between central visual function and inner retinal structure in POAG patients.
  • To compare these associations in early versus moderate to advanced stages of POAG.

Main Methods:

  • Enrolled 78 POAG patients and 58 healthy controls.
  • Assessed central visual function using isolated-check visual evoked potential (icVEP) and standard automated perimetry (SAP).
  • Measured inner retinal structure (ganglion cell layer+ inner plexiform layer thickness and peripapillary retinal nerve fiber layer thickness) using optical coherence tomography (OCT).

Main Results:

  • Signal-to-noise ratio (SNR) from icVEP, mean macular sensitivity (mMS) from SAP, and inner retinal thickness (IRT) measures were significantly reduced in POAG patients compared to controls.
  • Significant positive correlations were found between SNR and IRT measures in both early and moderate to advanced glaucoma.
  • Mean macular sensitivity (mMS) showed significant correlations with IRT measures, with stronger associations observed in moderate to advanced glaucoma.

Conclusions:

  • Central visual function, assessed by icVEP-SNR and mMS, is significantly linked to inner retinal structure in POAG.
  • The strength of these associations varies with glaucoma severity, with mMS being more strongly correlated with IRT in advanced stages.
  • These findings highlight the utility of icVEP and SAP in conjunction with OCT for a comprehensive assessment of POAG.