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How reliable is the Goldmann tonometer as a standard?
Journal of the American Optometric Association
|November 1, 1990
Summary
The XPERT NCT non-contact tonometer is highly accurate and reliable. Goldmann applanation tonometry (GAT) accuracy depends heavily on operator skill, highlighting the need for standardized protocols in clinical studies.
Area of Science:
- Ophthalmology
- Medical Devices
- Clinical Measurement
Background:
- Goldmann applanation tonometry (GAT) is a standard method for intraocular pressure measurement.
- Previous studies have established GAT's clinical utility, but its reliability can be operator-dependent.
Purpose of the Study:
- To clinically compare the accuracy and reliability of the XPERT NCT non-contact tonometer against Goldmann applanation tonometry (GAT).
- To evaluate the influence of operator technique on GAT measurements in a controlled clinical setting.
Main Methods:
- A clinical comparison involving 620 eyes, with 400 eyes measured by five clinicians using both XPERT NCT and GAT.
- Utilized four calibrated GAT reference tonometers and multiple GAT operators to assess performance indices.
- XPERT NCT measurements were analyzed for operator influence, with performance differences attributed to GAT operator technique.
Main Results:
- The XPERT NCT demonstrated high accuracy and reliability in intraocular pressure measurement.
- Significant variations in GAT performance were observed among different operators.
- Findings suggest that GAT's accuracy and reliability are contingent upon individual operator technique and experience.
Conclusions:
- The XPERT NCT is a dependable instrument for intraocular pressure measurement.
- Operator variability significantly impacts GAT accuracy, underscoring the need for standardized protocols.
- The study recommends applying specific protocol safeguards when using GAT as a reference in clinical comparisons to ensure data integrity.