A technique to measure eyelid pressure using piezoresistive sensors
Shaw, Alyra J., Davis, Brett A., Collins, Michael J., & Carney, Leo G. (2009) A technique to measure eyelid pressure using piezoresistive sensors. IEEE Transactions on Biomedical Engineering, 56(10), pp. 2512-2517.
Novel procedures were developed to use a thin (0.17 mm) tactile piezoresistive pressure sensor mounted on a rigid contact lens to measure upper eyelid pressure. A hydrostatic calibration system was constructed and the influence of conditioning (prestressing), drift (continued increasing response with a static load) and temperature variations on the response of the sensor were examined. To optimally position the sensor-contact lens combination under the upper eyelid margin, an in vivo measurement apparatus was constructed. Calibration gave a linear relationship between raw sensor output and actual pressure units, for loads between 1 and 10 mmHg (R²=0.96). Conditioning the sensor prior to use regulated the measurement response and sensor output stabilised about 10 seconds after loading. While sensor output drifts slightly over several hours, it was not significant over the measurement time of 1 minute used for eyelid pressure. The error associated with calibrating at room temperature but measuring at ocular surface temperature led to a very small overestimation of pressure. Eyelid pressure readings were observed when the upper eyelid was placed on the sensor and removed during a recording. When the eyelid pressure was increased by pulling the lids tighter against the eye, the readings from the sensor significantly increased.
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|Item Type:||Journal Article|
|Keywords:||Eyelid pressure, Measurement, Piezoresistive sensors|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Optometry and Ophthalmology not elsewhere classified (111399)
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
|Copyright Owner:||Copyright 2009 IEEE|
|Copyright Statement:||Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE."|
|Deposited On:||20 May 2009 09:39|
|Last Modified:||01 Mar 2012 00:09|
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