What Researchers Did
Researchers compared intraocular pressure measurements from two different devices, rebound and applanation tonometry, in 12 healthy subjects undergoing changes in atmospheric pressure inside a hyperbaric chamber.
What They Found
The study found systematic differences in intraocular pressure readings between rebound and applanation tonometry, with mean differences ranging from 1.6 to 2.6 mmHg across various pressures up to 4 ATA. However, these differences were not affected by the changes in atmospheric pressure. This suggests that rebound tonometry can still be a useful tool for monitoring intraocular pressure during hyperbaric exposures.
What This Means for Canadian Patients
For Canadian patients requiring hyperbaric oxygen therapy who also need their intraocular pressure monitored, this study indicates that rebound tonometry can provide consistent readings even under changing atmospheric pressures. While there is a systematic difference compared to applanation tonometry, this information helps clinicians choose appropriate monitoring methods and interpret results accurately during HBOT.
Canadian Relevance
No direct Canadian connection identified.
Study Limitations
The study was limited by its small sample size of healthy volunteers and did not include patients with pre-existing ocular conditions.