Posters
Determining the optimal design parameters of a transpalpebral tonometry sensor based on experimental simulation
Poster Details
First Author: E.Iomdina RUSSIA
Co Author(s): E. Klevtsov K. Ivanishchev O. Kiseleva A. Bessmertny O. Filippova P. Luzhnov
Abstract Details
Purpose:
Determining the optimal design parameters of a transpalpebral tonometry (TPT) sensor (the weight and diameter of the rod) based on experimental simulation.
Setting:
Moscow Helmholtz Research Institute of Eye Diseases, Russia
Methods:
The study conducted in situ at a forensic analysis department involved 12 eyes of 5 men and one woman aged 49-71. To ensure the accuracy of the TPT data and optimize sensor parameters, we compared the tonometric pressure with the true pressure measured using direct manometric technique. For this purpose, we designed and produced an experimental setup comprising a testing stand, a system of tubes filled with distilled water, a pressure gauge calibrated by heights of the water column, a millimeter scale ruler on a holder, and a needle with a connecting tube and two valves.
Results:
The thickness of the central area of the eyelid varied from 2.5 to 3 mm, which had little impact on tonometric data, with the exception of high levels of intraocular pressure (IOP). Contrariwise, different combinations of rod weight (11, 16 and 22.1 g) and diameter (1.5, 3 and 5 mm) varied pressure values quantitatively and qualitatively, increasing or reducing the difference between the tonometric and true IOP. When using a sensor weighing 16 g with the rod diameter of 1.5 or 3 mm, no statistically significant difference between the tonometric and manometric levels of ocular pressure was observed.
Conclusions:
The experimental study conducted on our setup has allowed us to substantiate the choice of a model of a sensor for transpalpebral IOP measurement, which enables achieving high accuracy of tonometry and can be recommended for clinical use to perform follow-up monitoring of the IOP level.
Financial Disclosure:
None
