[Comparison of dynamic contour tonometry (Pascal) with pneumotonometry and Goldmann tonometry].

Area of Science:

• Ophthalmology
• Medical Devices
• Clinical Measurement

Background:

• Intraocular pressure (IOP) measurement is crucial for diagnosing and managing glaucoma.
• Various tonometry devices exist, each with unique measurement principles and potential biases.

Purpose of the Study:

• To compare IOP measurements obtained from the Pascal tonometer, Goldmann tonometer, and pneumotonometer.
• To evaluate the reliability and agreement between these tonometry techniques.

Main Methods:

• An observational clinical study involving 205 randomly selected subjects.
• IOP measurements were taken using Pascal, Goldmann, and pneumotonometer in a randomized order.

Main Results:

• Pascal tonometer yielded significantly higher IOP readings than Goldmann and pneumotonometer (p<0.05).
• Pascal tonometer showed suboptimal data quality in a significant proportion of patients (unacceptable in 23.4%, impossible in 7.3%).
• Weak correlation and high discordance were observed between Pascal and the other two methods, particularly in corneas with pathology.

Conclusions:

• Pascal tonometer measurements are consistently higher than Goldmann tonometer readings.
• The reliability of Pascal tonometer is compromised in eyes with corneal pathologies, making measurements difficult or unacceptable.