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Related Experiment Videos

Intraocular pressure measurement after pars plana vitrectomy.

L V Del Priore1, R G Michels, M A Nunez

  • 1Vitreoretinal Surgery Service, Wilmer Ophthalmological Institute, Johns Hopkins Hospital, Baltimore, MD 21205.

Ophthalmology
|September 1, 1989
PubMed
Summary

The Schiøtz tonometer inaccurately measures intraocular pressure (IOP) after vitrectomy, especially with gas bubbles. The Digilab pneumatic tonometer offers a more reliable IOP measurement in these cases.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Accurate intraocular pressure (IOP) measurement is crucial for managing glaucoma and other ocular conditions.
  • Pars plana vitrectomy is a common surgical procedure that can affect IOP readings.
  • The presence of intravitreal gas after vitrectomy can significantly alter IOP measurements.

Purpose of the Study:

  • To evaluate the accuracy of different tonometers for measuring IOP after pars plana vitrectomy.
  • To compare the performance of Schiøtz, Goldmann, and Digilab pneumatic tonometers in eyes with and without intravitreal gas post-vitrectomy.

Main Methods:

  • Prospective study involving 47 eyes undergoing pars plana vitrectomy.
  • IOP measurements were taken using Schiøtz, Goldmann, and Digilab tonometers before and after surgery.

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  • Eyes were categorized based on the presence or absence of intravitreal gas on postoperative day one.

    • Main Results:

    • The Schiøtz tonometer significantly underestimated Goldmann IOP in eyes with intravitreal gas (35%) and without gas (13%).
    • The Digilab tonometer showed minimal underestimation compared to Goldmann IOP, even in the presence of intravitreal gas (18% with gas, 7% without gas).
    • No significant underestimation (>10 mmHg) by the Digilab tonometer was observed postoperatively.

    Conclusions:

    • The Schiøtz tonometer is unreliable for measuring IOP after pars plana vitrectomy, particularly when intravitreal gas is present.
    • The Digilab pneumatic tonometer provides a more accurate and reliable measurement of IOP in the post-vitrectomy setting, including eyes with intravitreal gas.
    • Clinical decisions regarding IOP management after vitrectomy should consider the limitations of certain tonometer types.