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Clinical evaluation of the Cavitron Biotronics tonometer
K Miller1, G E Sanborn, L W Jennings
1Department of Ophthalmology, University of Texas Southwestern Medical Center, Dallas 75235-9057.
Archives of Ophthalmology (Chicago, Ill. : 1960)
|September 1, 1988
Summary
The Cavitron Biotronics tonometer, replacing the Mackay-Marg, offers less accurate individual intraocular pressure readings. However, using the highest of four readings improves accuracy, though it may still underestimate or overestimate pressure.
Area of Science:
- Ophthalmology
- Biomedical Engineering
Background:
- The Mackay-Marg tonometer was a reliable tool for measuring intraocular pressure (IOP).
- It has been discontinued and replaced by the Cavitron Biotronics tonometer, which operates on a similar principle.
- The new device features a different recording display.
Purpose of the Study:
- To compare the accuracy of the Cavitron Biotronics tonometer with the Goldmann applanation tonometer for IOP measurement.
- To evaluate the performance of the Cavitron Biotronics tonometer in eyes with normal and diseased corneas.
Main Methods:
- The study involved 75 eyes.
- Accuracy of the Cavitron Biotronics tonometer was assessed against the Goldmann applanation tonometer.
- Individual and averaged readings from the Cavitron Biotronics tonometer were analyzed.
Main Results:
- Individual readings from the Cavitron Biotronics tonometer were less accurate than the original Mackay-Marg tonometer.
- When four readings were taken, the highest single reading from the Cavitron Biotronics tonometer showed the best correlation with Goldmann applanation tonometry.
- This method resulted in underestimation of IOP below 27 mm Hg and overestimation above this threshold.
Conclusions:
- The Cavitron Biotronics tonometer is a viable, albeit less precise, alternative for IOP measurement.
- Utilizing the highest of four readings can improve the accuracy of the Cavitron Biotronics tonometer.
- Clinical interpretation of readings should consider the instrument's tendency to underestimate or overestimate IOP at different pressure levels.