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Related Experiment Videos

The Honan intraocular pressure reducer. An experimental study.

P J McDonnell, H A Quigley, A E Maumenee

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |March 1, 1985
    PubMed
    Summary

    The Honan intraocular pressure reducer is safe for most surgeries, but high pressures in hypertensive eyes may pose a risk of vascular occlusion. Direct measurements confirmed lower intraocular pressures (IOP) in situ than post-enucleation.

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    Area of Science:

    • Ophthalmology
    • Surgical Innovation
    • Intraocular Pressure Measurement

    Background:

    • The Honan intraocular pressure reducer is widely used, presumed safe for reducing intraocular pressure (IOP) and vitreous loss.
    • Direct measurement of IOP during Honan device application is lacking.
    • Potential risks in hypertensive eyes remain unquantified.

    Purpose of the Study:

    • To directly measure intraocular pressures (IOP) generated by the Honan device.
    • To assess the safety of the Honan device across varying initial IOP levels.
    • To evaluate the risk of vascular occlusion in hypertensive eyes.

    Main Methods:

    • Utilized a pressure transducer in the anterior chamber to measure IOP in ten eyes from five patients post-mortem.
    • Measured IOP dynamics during Honan device application in situ.

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  • Compared IOP measurements before and after enucleation.

    • Main Results:

    • Peak IOPs generated by the Honan device were significantly lower in situ compared to post-enucleation.
    • The peak IOP increased proportionally with the initial IOP.
    • Elevated pressures were observed in hypertensive eyes (IOP ≥ 35 mm Hg).

    Conclusions:

    • The Honan device appears safe for routine anterior segment surgery.
    • Hypertensive eyes may be at risk for vascular occlusion due to potentially high pressures generated by the device.
    • Further investigation into pressure dynamics in specific patient populations is warranted.