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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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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.
Drugs such as carbonic anhydrase inhibitors, α2- and...
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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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Anatomy of the Eyeball01:20

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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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Related Experiment Video

Updated: Mar 15, 2026

Author Spotlight: Anterior HR-OCT as a Non-Invasive Tool for Characterizing Ocular Surface Squamous Neoplasia
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Choroidal Nevi.

David S Williams

    Journal of Insurance Medicine (New York, N.Y.)
    |August 27, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Choroidal nevi are common, benign melanocytic lesions found in the posterior uvea. These eye growths are typically harmless and do not cause vision problems.

    Keywords:
    Choroidal nevimelanoma

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    Area of Science:

    • Ophthalmology
    • Ocular Oncology

    Background:

    • Choroidal nevi are common benign melanocytic lesions.
    • They originate from the posterior uvea, a part of the eye's vascular layer.

    Purpose of the Study:

    • To provide a comprehensive overview of choroidal nevi.
    • To discuss their clinical significance and management.

    Main Methods:

    • Review of existing literature on choroidal nevi.
    • Analysis of diagnostic criteria and imaging techniques.

    Main Results:

    • Choroidal nevi are typically asymptomatic.
    • Risk stratification for malignant transformation is crucial.

    Conclusions:

    • Choroidal nevi are generally benign and require monitoring.
    • Early detection and regular follow-up are key to managing potential complications.