Search: id:"swepub:oai:DiVA.org:ltu-13099" >
An applanation reso...
An applanation resonator sensor for measuring intraocular pressure using combined continuous force and area measurement
-
- Eklund, Anders (author)
- Umeå universitet,Institutionen för medicinsk biovetenskap,Center for Biomedical Engineering and Physics, Umeå University,Umeå University Hospital, Department of Biomedical Engineering & Informatics
-
- Hallberg, Per (author)
- Umeå universitet,Institutionen för tillämpad fysik och elektronik,Center for Biomedical Engineering and Physics, Umeå University,Umeå University Hospital, Department of Biomedical Engineering & Informatics
-
- Lindén, Christina (author)
- Umeå universitet,Oftalmiatrik,Center for Biomedical Engineering and Physics, Umeå University
-
show more...
-
- Lindahl, Olof (author)
- Umeå universitet,Institutionen för tillämpad fysik och elektronik,Center for Biomedical Engineering and Physics, Umeå University
-
show less...
-
(creator_code:org_t)
- Association for Research in Vision and Ophthalmology (ARVO), 2003
- 2003
- English.
-
In: Investigative Ophthalmology and Visual Science. - : Association for Research in Vision and Ophthalmology (ARVO). - 0146-0404 .- 1552-5783. ; 44:7, s. 3017-24
- Related links:
-
https://urn.kb.se/re...
-
show more...
-
https://doi.org/10.1...
-
https://urn.kb.se/re...
-
show less...
Abstract
Subject headings
Close
- PURPOSE: For diagnostic purposes and for follow-up after treatment, it is important to have simple and reliable methods for measuring intraocular pressure (IOP). The purpose of this study was to develop a new applanation method for IOP measurement that uses combined continuous force and area measurement and to develop and evaluate an applanation resonator sensor (ARS) tonometer based on that method. METHODS: The tonometer was developed and evaluated in an in vitro porcine eye model, in which enucleated eyes were pressurized with a saline column. A model assuming that the applanation principle is valid over a certain interval of contact area was proposed. Continuous contact area was measured with a resonator sensor device, and contact force was measured with a force transducer, both mounted together in one probe. Reference IOP was measured in the vitreous chamber (IOP(VC)) with a standard fluid pressure transducer. RESULTS: An optimization algorithm determined the applanation interval that was optimal for calculating IOP(ARS). The corresponding time interval was 30 +/- 3 to 77 +/- 4 ms (mean +/- SD, n = 418) after initial contact. The proposed model showed a degree of explanation of R(2 [supi]) = 0.991 (n = 410, six eyes), corresponding to a correlation of r = 0.995 (n = 410) between IOP(ARS) and IOP(VC). The within-eyes precision (i.e., 95% confidence interval for the residuals between IOP(ARS) and IOP(VC)) was +/- 1.8 mm Hg (n = 410, six eyes). CONCLUSIONS: In this study, the ARS method for measuring IOP was evaluated in an in vitro porcine eye model and showed high precision. The ARS method is, to the authors' knowledge, the first to combine simultaneous, continuous sampling of both parameters included in the applanation principle: force and area. Consequently, there is a potential for reducing errors in clinical IOP tonometry.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Medicinteknik -- Annan medicinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Medical Engineering -- Other Medical Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Medical Engineering for Healthcare
- Medicinsk teknik för hälsovård
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database