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Related Concept Videos

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...
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.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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...
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

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...
Diabetic Retinopathy01:27

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...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...

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Related Experiment Video

Updated: Jul 12, 2026

Implantation and Evaluation of Melanoma in the Murine Choroid via Optical Coherence Tomography
05:46

Implantation and Evaluation of Melanoma in the Murine Choroid via Optical Coherence Tomography

Published on: December 2, 2022

Optic disc melanocytoma and glaucoma.

Sushma Rai1, Felipe A Medeiros, Leah Levi

  • 1Hamilton Glaucoma Center, Department of Ophthalmology, University of California, San Diego, CA 92093-0946, USA.

Seminars in Ophthalmology
|September 1, 2007
PubMed
Summary

This study discusses an 82-year-old man with optic disc melanocytoma and glaucomatous optic neuropathy. Differentiating the cause of optic nerve damage presents a diagnostic challenge.

Area of Science:

  • Ophthalmology
  • Neuro-ophthalmology

Background:

  • Optic disc melanocytoma is a rare benign tumor.
  • Glaucomatous optic neuropathy is a progressive optic nerve disease.

Observation:

  • An 82-year-old male patient presented with concurrent optic disc melanocytoma and glaucomatous optic neuropathy.
  • The clinical presentation highlighted a diagnostic dilemma.

Findings:

  • The co-occurrence of these conditions makes it difficult to attribute optic nerve damage definitively to either melanocytoma or glaucoma.
  • Further investigation is needed to understand the relationship between these two conditions.

Implications:

  • This case underscores the importance of comprehensive diagnostic evaluation in complex ophthalmic presentations.

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  • Improved diagnostic methods are needed to differentiate optic nerve damage causes in such scenarios.