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    Goldmann and error correcting tonometry prisms compared to intracameral pressure

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    Author
    McCafferty, Sean
    Levine, Jason
    Schwiegerling, Jim
    Enikov, Eniko T.
    Affiliation
    Univ Arizona, Coll Opt Sci LLC, Coll Med, Dept Ophthalmol Intuor Technol
    Univ Arizona, Coll Med, Dept Ophthalmol
    Univ Arizona, Coll Optic Sci, Dept Ophthalmol
    Univ Arizona, Coll Engn, Dept Aerosp & Mech
    Issue Date
    2018-01-04
    Keywords
    Glaucoma
    Intraocular pressure
    IOP
    Goldmann
    Bias
    Error
    Perkins
    Tonometer
    Applanation
    CCT
    Central corneal thickness
    CRF
    Corneal resistance factor
    Intracameral
    Cadaver eye
    In vivo
    In vitro
    Head position
    Upright
    Supine
    Manometric
    Corneal hydration
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    Publisher
    BIOMED CENTRAL LTD
    Citation
    Goldmann and error correcting tonometry prisms compared to intracameral pressure 2018, 18 (1) BMC Ophthalmology
    Journal
    BMC Ophthalmology
    Rights
    © The Author(s). 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Background: Compare Goldmann applanation tonometer (GAT) prism and correcting applanation tonometry surface (CATS) prism to intracameral intraocular pressure (IOP), in vivo and in vitro. Methods: Pressure transducer intracameral IOP was measured on fifty-eight (58) eyes undergoing cataract surgery and the IOP was modulated manometrically to 10, 20, and 40 mmHg. Simultaneously, IOP was measured using a Perkins tonometer with a standard GAT prism and a CATS prism at each of the intracameral pressures. Statistical comparison was made between true intracameral pressures and the two prism measurements. Differences between the two prism measurements were correlated to central corneal thickness (CCT) and corneal resistance factor (CRF). Human cadaver eyes were used to assess measurement repeatability. Results: The CATS tonometer prism measured closer to true intracameral IOP than the GAT prism by 1.7+/-2.7 mmHg across all pressures and corneal properties. The difference in CATS and GAT measurements was greater in thin CCT corneas (2.7+/-1.9 mmHg) and low resistance (CRF) corneas (2.8+/-2.1 mmHg). The difference in prisms was negligible at high CCT and CRF values. No difference was seen in measurement repeatability between the two prisms. Conclusion: A CATS prism in Goldmann tonometer armatures significantly improve the accuracy of IOP measurement compared to true intracameral pressure across a physiologic range of IOP values. The CATS prism is significantly more accurate compared to the GAT prism in thin and less rigid corneas. The in vivo intracameral study validates mathematical models and clinical findings in IOP measurement between the GAT and CATS prisms.
    ISSN
    1471-2415
    PubMed ID
    29301514
    DOI
    10.1186/s12886-017-0668-z
    Version
    Final published version
    Sponsors
    NIH SBIR Grant [R43 EY026821-01]; Arizona Eye Consultants, Tucson, AZ; Abbott Medical Optics
    Additional Links
    https://bmcophthalmol.biomedcentral.com/articles/10.1186/s12886-017-0668-z
    ae974a485f413a2113503eed53cd6c53
    10.1186/s12886-017-0668-z
    Scopus Count
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