Journal
MEASUREMENT SCIENCE REVIEW
Volume 20, Issue 4, Pages 171-177Publisher
SCIENDO
DOI: 10.2478/msr-2020-0021
Keywords
Glaucoma; tonometry; IOP measurements; non-contact; calibration; standard
Categories
Funding
- inTENSE project [16RPT03]
- Faculty of Mechanical Engineering of the Slovak University of Technology in Bratislava
- Czech Metrology Institute
- Department of Ophthalmology, Faculty of Medicine, Comenius University in Bratislava
- Hospital Ruzinov
- grant agency APVV [15-0295, 18-0066]
- VEGA [1/0098/18, 1/0556/18]
- KEGA [065STU-4/2018, 023STU-4/2020, 019STU-4/2020, 014STU-4/2020]
- European Union
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This paper focuses on the problematic of intraocular pressure (TOP) measurements, performed by non-invasive methods. More specifically, the devices that are connected with the presented finding are non-contact tonometers that use concentrated air stream and optical sensors to determine the TOP within a human's eye. The paper analyzes various influential factors that have an effect on the determination of the IOP values originating from the patients themselves and from the non-contact tonometer devices. The paper furthermore elaborates on the lack of independent methods of calibration and control of these devices. In order to fill this gap a measurement standard device that is capable of calibrating and testing these devices with traceability to the basic SI unit is presented. A detailed characterization and the determination of the expected uncertainty of the device are provided. By introducing an independent and traceable calibration method and control of non-contact tonometers into the clinical practice, the reliability of the measured IOP that is the primary indicator of glaucoma can be improved.
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