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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...
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...

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Related Experiment Video

Updated: Jun 10, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

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Published on: May 25, 2020

Indirect ophthalmoscopes: evaluation for potential hazard.

S A Miller, R H James, D H Sliney

    Applied Optics
    |August 20, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Indirect ophthalmoscopes emit high levels of optical radiation, including ultraviolet and infrared. While generally below safety limits, filters and reduced exposure settings can minimize patient risk.

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    Area of Science:

    • Ophthalmology
    • Biomedical Optics
    • Occupational Health

    Background:

    • Indirect ophthalmoscopes are crucial diagnostic tools in ophthalmology.
    • Assessment of optical radiation exposure from medical devices is essential for patient safety.
    • Previous studies have indicated potential risks associated with optical radiation from ophthalmic instruments.

    Purpose of the Study:

    • To measure and evaluate the optical radiation emitted by indirect ophthalmoscopes.
    • To compare measured radiation levels against established Threshold Limit Values (TLVs).
    • To identify potential methods for reducing patient exposure to harmful radiation.

    Main Methods:

    • Eight indirect ophthalmoscope devices were selected for the study.
    • Optical radiation (ultraviolet, visible, and infrared) emissions were quantified for each device.
    • Measured levels were compared to TLVs set by the American Conference of Governmental Industrial Hygienists.

    Main Results:

    • Several devices emitted excessive levels of ultraviolet (UV) and infrared (IR) radiation.
    • Most ophthalmoscopes emitted radiation levels below the established TLVs.
    • Visible light emissions were also measured across the tested devices.

    Conclusions:

    • While most devices comply with TLVs, high UV and IR emissions are unnecessary.
    • Implementing blocking filters can effectively reduce UV and IR radiation.
    • Minimizing exposure duration and power settings further enhances patient safety during ophthalmoscopy.