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Related Experiment Videos

XPERT NCT--a clinical evaluation.

K J Myers1, P Lalle, A Litwak

  • 1VA Outpatient Clinic, Grand Rapids, MI 49502.

Journal of the American Optometric Association
|November 1, 1990
PubMed
Summary
This summary is machine-generated.

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The XPERT non-contact tonometer (NCT) shows high accuracy and reliability in measuring intraocular pressure (IOP). This clinical evaluation found it comparable to Goldmann applanation tonometry (GAT), offering a convenient and user-friendly alternative.

Area of Science:

  • Ophthalmology
  • Medical Device Evaluation
  • Glaucoma Diagnostics

Background:

  • Accurate intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
  • Goldmann applanation tonometry (GAT) is a standard reference but can be operator-dependent.
  • Non-contact tonometers (NCTs) offer potential advantages in ease of use and infection control.

Purpose of the Study:

  • To clinically evaluate the accuracy and reliability of the Reichert XPERT NCT.
  • To compare XPERT NCT measurements against established Goldmann applanation tonometry (GAT) readings.
  • To assess the usability and patient acceptance of the XPERT NCT.

Main Methods:

  • A clinical evaluation involving 620 eyes at the Baltimore VA Medical Center.
  • Simultaneous measurements using the XPERT NCT and calibrated Goldmann applanation tonometers (GATs) by multiple operators.

Related Experiment Videos

  • Varied measurement intervals (minutes to an hour) to account for potential variability.

    • Main Results:

    • XPERT NCT measurements showed close agreement with GAT.
    • Population IOP means agreed within 0.3 mmHg.
    • Regression analysis yielded a slope (m) of 1.025 and a Y-intercept (b) of 0.7 mmHg, with a standard deviation of matched pair differences (Sd) of 2.7 mmHg.

    Conclusions:

    • The XPERT NCT is a highly accurate and reliable instrument for IOP measurement.
    • It demonstrated convenience, ease of use, and positive acceptance by staff and patients.
    • Compared to older NCT models, the XPERT NCT features a quieter and less intense air-puff.