Method and apparatus for detecting natural modes of vibration of an eye by laser interferometry, and an application thereof to measuring intraocular pressure
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United States of America Patent
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Oct 28, 2008
Grant Date -
Mar 11, 2004
app pub date -
Oct 9, 2001
filing date -
Oct 10, 2000
priority date (Note) -
Expired
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Abstract
The eye is positioned relative to a detection device in such a manner as to co-operate with the device to form a Fabry-Perot cavity having a main optical axis and comprising two opposite reflecting faces on the main optical axis, one of these two faces being constituted by a stationary reflecting element and the other being formed by the cornea of the eye. An incident laser beam is injected into said cavity so as to be centered on the main optical axis of the Fabry-Perot cavity, the cornea is aligned laterally and longitudinally relative to the main optical axis in such a manner as to obtain longitudinal interference between the go and the return laser beams reflected between the two reflecting faces of the cavity, and an optoelectronic detector is used to detect the intensity I of said interference as a function of time. The invention is applicable to measuring intraocular pressure.
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