UNSPECIFIED (2002) Active non-contact tonometer for glaucoma detection. In: Photonics Asia Symposium 2002, OCT 14-18, 2002, SHANGHAI, PEOPLES R CHINA.

Full text not available from this repository.

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)
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
Date:	2002
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
URI:	http://wrap.warwick.ac.uk/id/eprint/10324

Data sourced from Thomson Reuters' Web of Knowledge

Request changes to a record

Actions (login required)

View Item