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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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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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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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Can hemifacial spasm lead to glaucomatous changes?

K K H Lai1, A Tsang1, A K T Kuk1

  • 1Department of Ophthalmology, Tung Wah Eastern Hospital, 19 Eastern Hospital Road, Causeway Bay, Hong Kong.

Journal Francais D'Ophtalmologie
|March 9, 2022
PubMed
Summary

Hemifacial spasm patients with glaucoma required higher Botox dosages, linked to elevated intraocular pressure. Further research is needed to understand if hemifacial spasm causes glaucoma progression.

Keywords:
BotoxBotulinum toxinGlaucomaGlaucomeHemifacial spasmIntraocular pressurePression intraoculaireSpasme hémifacialToxine botulique

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Area of Science:

  • Ophthalmology
  • Neurology

Background:

  • Hemifacial spasm (HFS) is a neurological condition characterized by involuntary contractions of facial muscles.
  • Glaucoma is a group of eye conditions that damage the optic nerve, often associated with elevated intraocular pressure (IOP).
  • Botulinum toxin (Botox) injections are a common treatment for HFS.

Purpose of the Study:

  • To investigate the association between hemifacial spasm and glaucoma.
  • To evaluate if glaucoma diagnosis in HFS patients correlates with the required Botox dosage.
  • To explore the relationship between Botox dosage, intraocular pressure, and glaucoma in HFS patients.

Main Methods:

  • Retrospective review of clinical and procedural records.
  • Analysis of data from 76 consecutive patients with HFS treated with Botox.
  • Comparison of Botox dosage, intraocular pressure, and glaucoma status between patient groups.

Main Results:

  • 13% of HFS patients studied were diagnosed with glaucoma (POAG and CACG).
  • Glaucoma patients required significantly higher Botox dosages (31±8 units vs. 26±7 units).
  • A positive correlation was found between presenting intraocular pressure and required Botox dosage (R=0.31, P=0.0116).

Conclusions:

  • Hemifacial spasm patients diagnosed with glaucoma tend to require higher Botox dosages.
  • Elevated presenting intraocular pressure is associated with increased Botox dosage requirements in HFS patients.
  • The potential causal link between hemifacial spasm, intraocular pressure fluctuations, and glaucomatous damage warrants further investigation.