Active non-contact tonometer for glaucoma detection
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.
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|
|Editor:||Chance, B and Chen, M and Yoon, G|
|Number of Pages:||8|
|Page Range:||pp. 143-150|
|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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