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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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Related Experiment Video

Updated: Apr 20, 2026

Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents
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Ocular perfusion pressure during pars plana vitrectomy: a pilot study.

Tommaso Rossi1, Giorgio Querzoli2, Giampiero Angelini3

  • 1Eye Hospital of Rome, Rome, Italy.

Investigative Ophthalmology & Visual Science
|December 4, 2014
PubMed
Summary

Pars plana vitrectomy (PPV) can cause significant drops in mean ocular perfusion pressure (MOPP), increasing risks for vision loss. Specific surgical steps like silicone oil removal and phacoemulsification require careful MOPP monitoring.

Keywords:
intraocular pressuremean arterial pressuremean ocular perfusion pressurepars plana vitrectomy

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Area of Science:

  • Ophthalmology and Surgical Science
  • Intraocular Pressure and Perfusion Dynamics

Background:

  • Pars plana vitrectomy (PPV) is associated with unexplained visual field loss in up to 14% of cases.
  • Ocular hypoperfusion, resulting from inadequate blood pressure or elevated intraocular pressure, is a suspected cause of vision loss post-PPV.

Observation:

  • This study monitored intraoperative intraocular pressure (IOP) and non-invasive blood pressure (NBP) during PPV.
  • Mean ocular perfusion pressure (MOPP) was calculated in real-time to assess pressure variations.

Findings:

  • During PPV, IOP increased while NBP decreased, leading to an average MOPP reduction of 37.1%.
  • 88.8% of patients experienced significant MOPP decrease, with many spending over 20% of surgery time below a critical threshold (30 mm Hg).
  • Maneuvers like silicone oil removal and phacoemulsification were linked to greater MOPP drops.

Implications:

  • PPV can cause significant and prolonged MOPP reduction, potentially leading to vision impairment.
  • Surgical techniques such as silicone oil removal and combined phacoemulsification increase the risk of MOPP reduction.
  • Careful consideration of anesthetic choices, particularly deep sedation, is advised to avoid further MOPP decrease.