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Related Concept Videos

Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Graves' Disease I: Introduction01:28

Graves' Disease I: Introduction

Graves' disease is an autoimmune disorder that causes hyperthyroidism, or overactivity of the thyroid gland. It results from autoantibodies called thyroid-stimulating immunoglobulins (TSIs), which bind to thyroid-stimulating hormone (TSH) receptors, leading to overstimulation of hormone production and a hypermetabolic state.EtiologyAlthough considered idiopathic, Graves’ disease has well-established contributing factors. There is a strong genetic component, with increased prevalence in...
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
Glaucoma: Overview01:25

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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The Thyroid Gland

The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Related Experiment Video

Updated: May 20, 2026

Multifocal Electroretinograms
16:49

Multifocal Electroretinograms

Published on: December 4, 2011

Multifocal visual evoked potential in thyroid associated ophthalmopathy.

Mohamed Ibrahim Salah1, Amany Abd Al-Fattah El-Shazly1, Doaa Maamoun Ashour2

  • 1Ophthalmology Department, Faculty of Medicine, Ain Shams University, Cairo, Egypt.

Documenta Ophthalmologica. Advances in Ophthalmology
|May 19, 2026
PubMed
Summary
This summary is machine-generated.

Multifocal visual evoked potential (mfVEP) may detect subtle visual function changes in thyroid-associated ophthalmopathy (TAO) patients. However, these mfVEP findings were not statistically significant after adjustments, despite normal optical coherence tomography (OCT) and visual field results.

Keywords:
Electrophysiology in thyroid eye diseaseMultifocal visual evoked potentialPreclinical optic neuropathyThyroid associated ophthalmopathy

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Multifocal Electroretinograms
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Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Endocrinology

Background:

  • Thyroid-associated ophthalmopathy (TAO) can affect visual function.
  • Assessing visual function in TAO patients without clinical optic neuropathy is crucial.
  • Subtle visual pathway changes may precede overt clinical signs.

Purpose of the Study:

  • To evaluate visual function in TAO patients without optic neuropathy using multifocal visual evoked potential (mfVEP).
  • To correlate mfVEP findings with Humphrey visual field (HVF) and optical coherence tomography (OCT) results.
  • To investigate early indicators of visual dysfunction in TAO.

Main Methods:

  • Observational case-control study comparing euthyroid TAO patients and healthy controls.
  • Ophthalmological assessment including HVF, OCT (RNFL and GCC), and mfVEP.
  • mfVEP signal-to-noise ratio (SNR) analyzed in specific sectors (rings 5-6).

Main Results:

  • No significant differences in RNFL thickness, GCC thickness, or HVF parameters between groups.
  • Initial mfVEP analysis showed lower SNR in TAO patients before multiple comparisons correction.
  • Significant main effects for patient group and test location in mfVEP, but no significant interaction.

Conclusions:

  • Initial mfVEP results suggested reduced SNR in TAO patients without clinical optic neuropathy.
  • These mfVEP findings lacked statistical robustness after adjustment for multiple comparisons.
  • mfVEP alterations were observed despite normal OCT and HVF, warranting further investigation.