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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.
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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 Rodent Model of Nonarteritic Anterior Ischemic Optic Neuropathy (rNAION)
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Delayed optic nerve complications after proton beam irradiation.

Joseph G Chacko1, Norman J Schatz, Joel S Glaser

  • 1Bascom Palmer Eye Institute, University of Miami, Miller School of Medicine, Miami, FL, USA. jchacko@uams.edu

Annals of Ophthalmology (Skokie, Ill.)
|February 24, 2009
PubMed
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Delayed optic nerve complications, including neuropathy and hemorrhage, can occur after proton beam radiotherapy. These rare but severe events can lead to blindness, highlighting treatment risks.

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Area of Science:

  • Ophthalmology
  • Radiation Oncology
  • Neurology

Background:

  • Proton beam radiotherapy (PBRT) is an advanced cancer treatment utilizing protons for precise radiation delivery.
  • PBRT is increasingly used for tumors near critical structures like the optic nerve.
  • Understanding the long-term effects of PBRT on the optic nerve is crucial for patient safety.

Observation:

  • Two patients developed delayed optic nerve complications after PBRT.
  • Patient 1 experienced sequential radiation optic neuropathy 5 and 9 months post-PBRT for clival chordoma.
  • Patient 2 presented with optic nerve hemorrhage following PBRT for optic nerve sheath meningioma.

Findings:

  • These cases illustrate that PBRT can lead to severe, delayed optic nerve damage.
  • Radiation optic neuropathy and optic nerve hemorrhage are potential sight-threatening complications.
  • The latency of these complications underscores the need for long-term ophthalmologic surveillance.

Implications:

  • The findings highlight the inherent risks of PBRT, even with precise targeting.
  • Ophthalmologists and radiation oncologists must be aware of these potential delayed complications.
  • Further research is needed to elucidate the mechanisms and identify preventative strategies for radiation-induced optic nerve injury.