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Active non-contact tonometer for glaucoma detection
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UNSPECIFIED (2002) Active non-contact tonometer for glaucoma detection. In: Photonics Asia Symposium 2002, SHANGHAI, PEOPLES R CHINA, OCT 14-18, 2002. Published in: OPTICS IN HEALTH CARE AND BIOMEDICAL OPTICS: DIAGNOSTICS AND TREATMENT, 4916 pp. 143-150. ISBN 0-8194-4705-6. ISSN 0277-786X.
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Abstract
Glaucoma is an increasingly common cause of visual impairment, and in some cases causes blindness. The approach to develop a low cost and non-contact tonometer for the detection of glaucoma, to replace the Goldmann tonometer used worldwide, is presented in this paper. The new tonometer exploits the vibration property of the cornea - the resonance frequency of the cornea rises with increasing intra-ocular pressure (IOP). An audio frequency signal is used to vibrate the cornea of the eye, the vibration of the cornea is measured using a fibre optic lever probe, and then the IOP can be calculated from the detected resonance frequency of the cornea. The initial PC-version experiment system of the new tonometer has been demonstrated and preliminary testing has been performed, showing a suitable sensitivity in detecting the resonance frequency against the IOP using both the simulated-eye model and the pig's eye. The initial system has been improved to be suitable for greater than 15mm detecting distance, and the measurement of vibrations of human cornea in-vivo has been carried out. Work is now focusing on increasing the sensitivity of the fibre probe, and reducing the measuring time to less than I second.
Item Type: | Conference Item (UNSPECIFIED) | ||||
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Subjects: | Q Science > QC Physics | ||||
Series Name: | PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) | ||||
Journal or Publication Title: | OPTICS IN HEALTH CARE AND BIOMEDICAL OPTICS: DIAGNOSTICS AND TREATMENT | ||||
Publisher: | SPIE-INT SOC OPTICAL ENGINEERING | ||||
ISBN: | 0-8194-4705-6 | ||||
ISSN: | 0277-786X | ||||
Editor: | Chance, B and Chen, M and Yoon, G | ||||
Official Date: | 2002 | ||||
Dates: |
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Volume: | 4916 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 143-150 | ||||
Publication Status: | Published | ||||
Title of Event: | Photonics Asia Symposium 2002 | ||||
Location of Event: | SHANGHAI, PEOPLES R CHINA | ||||
Date(s) of Event: | OCT 14-18, 2002 |
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